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THE PROSPECTIVE MOTHER
A Handbook for Women During Pregnancy
by
J. MORRIS SLEMONS
Associate Professor of Obstetrics,
The Johns Hopkins University.
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PREFACE
This book, written for women who have no special knowledge of medicine, aims to answer the questions which occur to them in the course of pregnancy. Directions for safeguarding their health have been given in detail, and emphasis has been placed upon such measures as may serve to prevent serious complications. Treatment of such conditions has not been discussed, as it can be judiciously carried out only by a physician who has the opportunity to observe and study the individual patient. Furthermore, if there is to be notable improvement in the management of cases of childbirth, the appearance of untoward symptoms should not be awaited before consulting a physician; on the contrary, prospective mothers must be taught that they should be under competent medical supervision throughout pregnancy.
At present intelligent women demand some knowledge of the anatomical and physiological changes incident to the development of the embryo and the birth of the child. These subjects do not readily lend themselves to popular description, but I have told the story as simply as possible, following in a general way the text-book of my teacher and friend, Professor J. Whitridge Williams; indeed, my main purpose has been to reproduce his book "in words of one syllable." The use of a number of technical words has been unavoidable, and, though their meaning has been given in the context, it has not been feasible to repeat the definition every time an unfamiliar term was used. On that account a glossary has been provided.
It is with pleasure that I avail myself of this opportunity to acknowledge the cheerfully given assistance of many friends. In particular I wish to thank Doctor Henry M. Hurd, until recently Superintendent of the Johns Hopkins Hospital, for his interest and advice. I am also under deep obligation to my friend John C. French, of the English Department of the Johns Hopkins University, for helpful criticism of the manuscript, and to my colleagues, Doctors Rupert Norton and Thomas R. Boggs, for valuable assistance. To many others—doctors, nurses, and patients—I am indebted for numerous suggestions which have been made either consciously or unconsciously.
J. MORRIS SLEMONS.
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INTRODUCTION
In all branches of medicine the master word is prophylaxis, or prevention, and its benefits are nowhere more strikingly illustrated than in the practice of obstetrics. In former times every woman who gave birth to a child or passed through a miscarriage was exposed to grave danger of infection or child-bed fever; but at present—thanks to the recognition of the bacterial origin of the disease and of its identity with wound infection—this danger can be practically eliminated by the rigid observance of surgical cleanliness and aseptic technique. Physicians have also learned that the most effective method of coping with other serious complications of pregnancy and labor is by preventing their occurrence, or at least by subjecting them to treatment in their earliest stages; for, if they be allowed to go on to full development, the results are little better than in times past. Furthermore, a careful examination some weeks before the expected date of confinement enables us to recognize the existence of abnormal presentations and of disproportion between the size of the mother's pelvis and that of the child's head. Timely recognition of such conditions makes appropriate treatment possible and practically insures a successful outcome; while tardy recognition is frequently followed by disastrous results.
These few examples give some idea of the benefits of prophylaxis in the practice of obstetrics. Prospective mothers should understand not only that there is an advantage in taking such precautions, but that they may be risking their lives, or at least their future well-being, unless they insist upon competent medical attention. It is true, of course, that pregnancy and childbirth are generally normal processes, but they are not always so. Fortunately, most of the abnormalities give timely warning of their occurrence, and in most instances may be relieved by comparatively simple measures; or, if not, they afford indications for treatment which should lead to a happy termination. The recognition of the existence of such conditions, however, is not always easy, and their ideal treatment requires careful training and sometimes the utmost nicety of judgment. Consequently, if prospective mothers wish to be assured of the best care, they should be cautious in the choice of their medical attendant. As the ordinary layman has no means of determining the real qualifications of a physician, the choice should not be made upon the advice of casual acquaintances; but, instead, the family physician should be consulted, who, should he feel unwilling to assume the responsibility of the case, will be able to recommend a thoroughly competent substitute.
From my own experience as a teacher and consultant, I state without hesitation that in no other branch of medicine or surgery are graver emergencies encountered than in certain obstetrical complications whose treatment involves the greatest responsibility and requires the highest order of ability to insure a successful outcome for the mother and her child. For these reasons a physician should be chosen only after mature deliberation, and his services should be esteemed much more highly than is usually the case.
In order that the principles of prevention may receive their fullest application during pregnancy, labor, and the lying-in period, it is also advisable that intelligent women should possess some knowledge of the Reproductive Process in human beings. This information is imparted by Doctor Slemons' book, which I can thoroughly recommend to prospective mothers. The subject matter has been carefully chosen, and the author has wisely refrained from giving advice with regard to treatment which can be satisfactorily directed only after careful study by a physician. At the same time he has given a clear account of the physiology of pregnancy and labor, and has laid down sound rules for the guidance of the patient.
One of the most important facts emphasized by Doctor Slemons is the value of medical supervision for several weeks after the child is born; this precaution contributes greatly toward a rapid and complete convalescence. During the lying-in period the physician should supervise the care of the mother and the child, should insist upon the necessity for maternal nursing, and should keep the mother under observation until perfectly normal conditions are regained. If the latter duty is conscientiously fulfilled many years of invalidism may be saved and thousands of operations rendered unnecessary.
Although there have been notable advances in the science and in the art of obstetrics since the middle of the eighteenth century, a great many fundamental facts must yet be learned. For example, we are almost totally ignorant of the stimulus which causes the mother to fall into labor approximately 280 days after the last normal menstruation.
There are two points which I desire to impress especially upon the readers of this book. Firstly, that the advance of the science of obstetrics, and consequently improvements in its practice, must depend greatly upon the cooperation of intelligent women. They must come to realize that they will secure the best treatment only as they demand the highest standard of excellence from their attendants; and they can aid in securing this for their poorer sisters and their children by interesting themselves in obstetrical charities.
Secondly, they must realize that real progress in the science of obstetrics can be expected to proceed only from well equipped clinics connected with strong universities, and in charge of thoroughly trained and broad-minded men. As yet such institutions scarcely exist in this country. Women who are anxious to promote the welfare of their sex can find no better way of doing so than by bringing this need to the attention of wealthy men interested in philanthropy and education. Furthermore, they should bear in mind that most of our important discoveries would not have been made had animal experimentation not been available, as it is solely by this means that modern surgical and obstetrical technique has been brought to its present degree of perfection; and further progress can scarcely be expected without its aid. They should remember also that whenever they take such a well-known drug as ergot for the control of bleeding, or make use of many other apparently simple measures, they are unconsciously rendering tribute to this type of investigation.
J. WHITRIDGE WILLIAMS.
Johns Hopkins University,
September, 1912.
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CONTENTS
I. THE SIGNS OF PREGNANCY AND THE DATE OF CONFINEMENT II. THE DEVELOPMENT OF THE OVUM III. THE EMBRYO IV. THE FOOD REQUIREMENTS DURING PREGNANCY V. THE CARE OF THE BODY VI. GENERAL HYGIENIC MEASURES VII. THE AILMENTS OF PREGNANCY VIII. MISCARRIAGE IX. THE PREPARATIONS FOR CONFINEMENT X. THE BIRTH OF THE CHILD XI. THE LYING-IN PERIOD XII. THE NURSING MOTHER GLOSSARY
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The Prospective Mother
CHAPTER I
THE SIGNS OF PREGNANCY AND THE DATE OF CONFINEMENT
The Positive Signs—The Probable Signs—The Presumptive Signs: The
Cessation of Menstruation; Changes in the Breasts; Morning Sickness;
Disturbances in Urination—The Duration of Pregnancy—The Estimation
of the Date of Confinement—Prolonged Pregnancy.
Many puzzling questions occur to the woman who is about to become a mother. Most of these questions are reasonable and natural, and should be frankly answered; but a false conventionality has—until recently, at least—forbidden any open discussion of facts connected with childbirth. The inevitable result has been that, without experience of their own to guide them, prospective mothers have sought advice from older women, whose experience was at best very narrow, and whose views were often biased by tradition. Or, distrusting such sources of information, they have consulted technical medical works which they could not understand. Either of these methods is very likely to result in misinformation and to cause unnecessary anxiety. Yet no one need be alarmed by a plain, accurate account of Nature's plan to provide successive generations of human beings. Some trustworthy knowledge of a process so fundamental should be part of every person's education; it is especially helpful to women who are pregnant because it affords a rational basis for hygienic measures which they should adopt. A popular work, however, no matter how frank and helpful it may be, will not enable one to dispense with professional advice. For the prospective mother no counsel is more important than this: Put yourself at once under the care of a physician.
Insistence on the importance of medical advice should not be taken to imply that pregnancy is to be regarded as other than a normal process. Its dangers are comparatively slight, as we should expect, since the property of all living matter to reproduce its kind is both fundamental and essential; the continuance of living creatures in this world, plants as well as animals, depends upon the Reproductive Process. And yet, natural as it is, pregnancy may be attended by complications. Such complications, though happily rare, are to be guarded against in every case, and that may be most effectually done if patients are taught to remain under competent medical supervision from the time of conception until several weeks after the child is born. This precaution greatly reduces the frequency of annoyances during pregnancy and also assists materially toward conducting a birth to a safe conclusion. Moreover, if this advice is followed, when complications do arise they will be recognized and dealt with promptly; they will not be permitted to grow more serious until, perhaps, they may jeopardize the life of the mother or the child or both.
The initial symptoms of pregnancy are so widely known that in most instances the prospective mother herself makes the diagnosis shortly after conception has taken place; but now and then pregnancy advances for several months unrecognized and is then detected by a physician who has been consulted on account of symptoms which the patient has incorrectly attributed to some other condition. On the other hand, women sometimes suspect that they are pregnant when they are not; and such mistakes occur because certain symptoms which are implicitly trusted by the laity as manifestations of pregnancy are occasionally associated with conditions quite foreign to it. It is clear that one interested in the matter must know not only what the manifestations of pregnancy are and when they appear, but also how far the evidence that they give is reliable.
The signs of pregnancy may be classified, according to their reliability, as presumptive, probable, and positive. The doubtful evidence appears first and the infallible proof last. No one need be surprised, therefore, if, when her suspicion is first aroused, she is unable to decide positively whether she is pregnant. Physicians of broad experience, possessed of facilities for observation which their patients cannot employ, may find it necessary to make more than one examination before they commit themselves to a definite opinion; in some cases, though very rarely, they must wait for two or three months to be able to do this.
THE POSITIVE SIGNS.—The earliest absolutely trustworthy manifestation of pregnancy is the motion of the fetus. The perception by the mother of these movements, which is spoken of as "quickening," generally occurs toward the eighteenth week, if she has been told to watch for them; otherwise they may pass unnoticed until the twentieth week or later. At first the motion, felt in the lower part of the abdomen, is very gentle; it has been variously likened to tapping, or to quivering, or to the fluttering of a bird's wings. As time goes on the movements grow stronger and occur more frequently; they are, however, perceived but rarely throughout the day and seldom interfere with sleep. Occasionally women are annoyed by the sensation and complain that the child is hardly ever quiet. Even these troublesome movements are never a cause for anxiety; but prolonged failure to feel motion after it is once well established should be reported to the doctor.
In the first pregnancy the passage of gas through the intestines may be mistaken for quickening long before the movements of the child are really perceptible; but those who have once experienced quickening will not be deceived. Whenever women who have borne children are in doubt the sensation is almost surely not quickening. Furthermore, in any doubtful case, the motion should be observed by a physician before being accounted a positive sign of pregnancy. This precaution will scarcely delay an absolutely positive diagnosis, since the proper method of examination reveals these movements to the physician almost as early as the patient feels them.
About the time these movements become perceptible another positive sign is available. The physician whose ear has been trained to catch such sounds when he listens over the lower part of the mother's abdomen will hear the fetal heart-beat. Other sounds may be audible there, but the character and the rate of the heart-sounds are distinctive. Since the child's heart beats almost twice as fast as the mother's, under ordinary conditions it is impossible to confuse one with the other. The mother never feels the beating of the child's heart, but occasionally she will mistake for it the throbbing of her own blood vessels.
Ability to hear the fetal heart not only provides a means of confirming the existence of pregnancy in doubtful cases, but also enables the physician to reassure his patient if she fails temporarily to feel the child move. Sometimes the presence of twins is recognized in this way. Toward the end of pregnancy the heart sounds are also of material assistance in determining what position the child has permanently assumed.
There is a third positive sign of pregnancy to which the physician has recourse, but generally it is inapplicable as early as those already mentioned. In the latter months of pregnancy it is possible to outline the child through the mother's abdominal wall. Although this procedure adds little or nothing to our resources for making an early diagnosis, the information it ultimately affords proves one of the greatest aids in the practice of obstetrics.
THE PROBABLE SIGNS.—Obviously, phenomena for which the child is responsible—such as have just been described—supply the most trustworthy evidence of pregnancy; and these phenomena alone are accepted as positive signs. But there are earlier manifestations which intimate very strongly that conception has taken place. Shortly after pregnancy has become established changes begin in the uterus, as physicians call the womb, and soon reach the point where they may be recognized by a simple examination which enables the physician to express an opinion little less than positive. As one result of pregnancy, for example, the supply of blood is increased to all the organs concerned with the reproductive process. Partly on account of this congestion and partly on account of embryonic development, the uterus becomes altered in a number of ways. Although these changes occur regularly in pregnancy, they may also occur when the womb is enlarged from other causes; therefore, if a physician should make the diagnosis of pregnancy whenever they were found, he would make it somewhat too frequently. With a little patience, however, he excludes the chance of being misled; a second examination, approximately four weeks after the first, will generally place the existence of pregnancy beyond question, for under normal conditions the degree of enlargement which takes place in a pregnant womb during a given interval is absolutely characteristic.
THE PRESUMPTIVE SIGNS.—Although women are most often led to suspect that they are pregnant by symptoms which are of such doubtful significance that they must be regarded as merely presumptive evidence, the practical value of these symptoms is attested by the fact that subsequent developments rarely fail to confirm the suspicion. Perhaps they prove misleading once or twice in a hundred cases; the number of mistakes is small, because the diagnosis is commonly made not from only one of these doubtful signs but from a group of them. In order of importance the doubtful or presumptive signs of pregnancy are these: (1) cessation of menstruation, (2) changes in the breasts, (3) morning sickness, (4) disturbances in urination.
The Cessation of Menstruation.—The failure of menstruation to appear when it is expected is nearly always the first symptom of pregnancy to attract attention, and, as a rule, when this happens to healthy women during the child-bearing period—which usually extends from the fifteenth to the forty-fifth year—it may be taken to indicate that conception has occurred. But there are exceptions to this very good rule. Besides pregnancy we are acquainted with several conditions that cause temporary suppression of menstruation; and to understand its significance we must learn something of the menstrual process itself.
Menstruation is a function of the womb and in all probability is brought about through the influence of the ovaries. The bleeding, popularly regarded as the entire menstrual process, is, in fact, indicative of only one of its stages; the others give rise to no symptoms whatever. What the stages in the menstrual process are, what relation they bear to each other, and what the significance of the whole process is, are problems that have been solved with the aid of the microscope. In this way the mucous membrane lining the womb has been studied both at the time of the periods and in the interval between them, and we have learned that it is constantly undergoing changes intended to facilitate the reception and the maintenance of an embryo. Anticipating these duties the mucous membrane receives a more abundant supply of blood; it also increases in thickness and all the structures which enter into its composition become more active. Unless conception takes place these preparations, which represent the most important phase in the menstrual process, are without value; and therefore failure to conceive means that the mucous membrane will return to the same condition as existed before the preparations were begun. The congestion is relieved by rupture of the smallest blood vessels, and there follow other retrogressive steps which completely restore the various structures to their former state. Then there is a pause, though it is not long, until preparatory changes are again initiated, or, as we say, another Menstrual Cycle is begun. Each cycle lasts twenty-eight days, and includes four stages, namely, a stage of preparation, of bleeding, of restoration, and of rest.
Although pregnancy may become established at any time during the interval between the periods of bleeding, it is more likely to be established just before a period is expected or shortly after it has ceased. Furthermore, whenever conception does take place, the preliminary preparations for the reception of the embryo are followed by much more elaborate arrangements for its protection and nutrition. Under these circumstances the hemorrhagic discharge does not appear.
Were there no other condition to bring about the cessation of menstruation, the diagnosis of pregnancy would be greatly simplified. But any one can appreciate the fact that diseases of the womb may interfere with the menstrual process. Menstruation is influenced, also, by the ovaries. As a result of age, for example, the ovaries undergo changes which invariably bring about the permanent cessation of menstruation, called the menopause. This event occurs prematurely if both the ovaries are removed by operation. In view of these facts it is not surprising that sometimes ovarian disorders abolish menstruation. An impoverished state of the blood, or nervous shock and strain, or constitutional debility may also interrupt the regular appearance of the menstrual discharge.
The value of menstrual suppression as an evidence of pregnancy is not, however, to be discounted to the extent that we might expect. This is true because the ailments which lead to confusion are relatively infrequent, and also because they exhibit characteristic symptoms which are foreign to pregnancy. Often these symptoms are obvious to the patient herself; if not to her, they will be obvious to her physician. It is about the doubtful cases, naturally, that a professional opinion is sought, and on that account physicians are perhaps inclined to overestimate the difficulty women have in learning for themselves whether or not they are pregnant. As a matter of fact, it is unusual for a prospective mother to fail to reach a correct decision—a decision for which she relies chiefly upon the suppression of her menstrual periods.
It is doubtful whether menstruation ever continues after conception has taken place. Instances in which the menstrual function is believed to persist are not uncommon, and yet in all probability the discharge regarded as menstrual has a different origin. In most cases it should be interpreted as meaning that there is some danger of miscarriage. Since miscarriage often occurs about the time a menstrual period would ordinarily be expected, there is unusual opportunity for confusing the symptoms. At all events women err much more frequently in suspecting that they are pregnant than in overlooking the condition. Indeed, pregnancy is not likely to be overlooked unless menstruation has been irregular or suppressed for a month or more previous to conception. Thus, in the case of nursing mothers in whom menstruation is already suppressed and who are, moreover, deprived of certain evidence that the breasts give, pregnancy may sometimes advance several months before it is recognized.
The Changes in the Breasts.—Various sensations in the breasts are accepted by women as a reliable sign of pregnancy; thus throbbing, tingling, pricking, or a feeling of fullness will be mentioned by one mother or another as having given her the first intimation that she was pregnant. A few women also find their breasts become tender immediately after they have conceived; this may be so marked that they cannot bear pressure. But unless such symptoms are accompanied by definite, visible changes, they have no value as signs of pregnancy.
About the end of the second month the nipples become larger and more erectile, and deepen in color. The pigmented, circular area of skin which surrounds the nipple, called the areola, also darkens. The shade that the areola assumes will vary according to the complexion of the individual, growing darker in brunettes than in blondes. Ultimately, within this pigmented circle a number of elevated spots appear about the size of a large shot. These spots betray the presence of tiny glands always located there which, on account of the better state of nutrition during pregnancy, grow larger, and generally become visible.
Usually, after two menstrual periods have been missed the breasts increase in size and firmness, and often the veins which run just beneath the skin stand out conspicuously. Before very long it is possible to squeeze from the breasts a fluid which many persons believe to be milk, though it is really colostrum, a substance that resembles milk but very slightly. At first colostrum is a clear, white fluid, but in the later months of pregnancy it becomes yellow and cloudy.
None of the changes in the breasts are absolutely characteristic of pregnancy; even the secretion of colostrum has been noted in association with various other conditions. Furthermore, as a sign of pregnancy the presence of colostrum is totally deprived of value in the case of a woman who has recently nursed an infant, for a small quantity of milk or colostrum often remains in the breasts for months after the infant is weaned. In general, however, women who have not been pregnant before should assume that they have conceived if, after missing a menstrual period, they note the characteristic changes in the breasts.
Morning Sickness.—Soon after conception many women suffer from nausea and vomiting, especially on rising in the morning. "Morning sickness" usually passes off in a few hours, although it may be more persistent. Perhaps this manifestation occurs more frequently in the first than in subsequent pregnancies, but certainly one-half, and probably two-thirds, of all prospective mothers suffer from it. Usually the nausea begins just after a menstrual period has been missed, and ceases about the third month or a little later.
But morning sickness is never counted an indication of pregnancy unless taken in conjunction with other symptoms, for individuals who are not pregnant may also suffer from nausea in the morning. On the other hand, a number of prospective mothers escape morning sickness altogether, and a few experience nausea at other times of day.
Disturbances in Urination.—It is not an uncommon belief that some characteristic change occurs in the urine shortly after conception. But this is not true; at least no change is revealed by any method of analysis known at present. Yet there are symptoms associated with the passage of the urine which appear very promptly and prevail for several weeks. Chief among these is the desire to empty the bladder frequently; some patients also have difficulty in urination, and a few experience discomfort with it. All the bladder symptoms gradually disappear about the fourth month, but become prominent again toward the end of pregnancy.
Since the inclination to empty the bladder more often than usual may be due merely to nervousness or to many other conditions, this symptom taken alone cannot be regarded as a definite sign of pregnancy. Indeed, it is mentioned, not because of its importance, but to point out that it is in no way connected with the kidneys, as patients are sometimes led to believe. It is a direct and natural result of pregnancy. Since the womb enlarges and tilts forward at a more acute angle than formerly, it presses against the bladder, giving the same sensation as when the bladder is distended with urine.
Although the presumptive signs which we have considered by no means exhaust the list, all the others are totally untrustworthy. Each of the more reliable symptoms, as we have seen, must be accepted cautiously; but taken altogether, except in very unusual cases, they may be relied upon. If, for example, menstruation has previously been regular and then a period is missed, the patient has good reason to suspect she is pregnant; if the next period is also missed and meanwhile the breasts have enlarged, the nipples darkened, and the secretion of colostrum has begun, it is nearly certain that she is pregnant; whether morning sickness and the desire to pass the urine frequently are present is of no importance. But the most characteristic evidence, we must remember, is not available until the eighteenth or twentieth week; then the signs of pregnancy are unmistakable.
THE DURATION OF PREGNANCY.—After the existence of pregnancy has become assured, perhaps the greatest interest centers about the date upon which the birth may be expected. Even to approach accuracy in this prediction the prospective mother must be familiar with certain facts which she will always observe, but which, unless she appreciates their importance early in pregnancy, she may fail to record or to remember. In a few cases, however, such exceptional information as knowing the date of conception does not lead to an absolutely accurate prediction. But the deviation from the rule will be understood only after we understand the rule itself, which is based upon what we accept as the average duration of human pregnancy, technically called the period of gestation.
In a broad sense, the period of gestation for each variety of mammal is determined by the time required for embryonic development to reach the point where the young may live independently of the mother. This point is reached more quickly with small animals than with large. The mouse, for example, generally brings forth its young in three weeks, whereas the pregnancy of the elephant lasts two years. In human beings, counting from the time of conception to the time of delivery, pregnancy continues approximately 273 days. This number is merely an estimate calculated from hundreds of cases in which there was no question as to the underlying facts. Individual cases vary notably, and indicate that two women may become pregnant on the same day and yet not necessarily be delivered at the same date.
Irregularities in the duration of pregnancy are not limited to man. Thus, while the mean period of gestation in the rabbit is thirty-one days, it may be either shorter or longer by as many as eight days. Similar variations occur in the pregnancies of all animals, and are, moreover, notably greater among larger animals, since for such animals the period of gestation is relatively long. For instance, the accurate observations of veterinarians indicate that the mean period of pregnancy in the cow is 285 days from the time of conception. This fact notwithstanding, a competent observer found that, of 160 cows, 67 were delivered before the 280th day; 68 between the 280th and the 290th day; and 25 after the 290th day. Although nothing unnatural was observed in any instance, the first animal was delivered 67 days before the last, and in 5 instances gestation continued 308 days.
In ancient times it was believed that the duration of pregnancy was of even more uncertain length in man than in the lower animals; but since the eighteenth century thirty-nine weeks have been accepted as the average duration of the human pregnancy when reckoned from the day of conception. As this date is seldom known, it is most convenient to reckon from the first day of the last menstrual period. Estimated in this way its average duration is 280 days. As this period corresponds to ten menstrual cycles, physicians prefer to describe pregnancy as lasting 10 lunar months of four weeks each. This is equivalent to 9 calendar months, in terms of which its duration is popularly stated.
THE ESTIMATION OF THE DATE OF CONFINEMENT.—Since pregnancy is not an absolutely fixed period, we possess no reliable means of predicting the exact day when it will end. The most satisfactory method of prediction consists in counting forward 280 days from the beginning of the last menstruation or, what gives the same result, counting backward eighty-five days from this date. To make the calculation in the simplest way we count back three months and add seven days; this addition is made because seven days generally represents the difference between three months and eighty-five days. If the last menstruation, for example, began on October 30th, we count back three months to July 30th and add seven days, which gives August 6th as the probable date of confinement.
A prospective mother should remember that this prediction is no more than approximate. The calculation does not give the exact date of delivery more than four or five times in a hundred cases. It is accurate within a week in half the cases and within two weeks in four-fifths. We also know that delivery is somewhat more likely to occur after the expected date than before it. But perhaps we shall get the clearest idea of the accuracy of the rule, or better still of its inaccuracy, if we imagine twenty patients to have the same predicted date, all of them giving birth to mature infants. The chances are that only one of these patients will be confined upon the day predicted; nine will be confined before and ten after it. In all probability five of those who pass the predicted day will be delivered within a week and four others within the second week, while the twentieth patient will not be delivered until three weeks or more have elapsed.
Such results clearly indicate our inability to make accurate predictions even though pregnancy is normal in every way. Whenever patients pass their expected date uneventfully, if they will bear in mind that the fault lies with the method of prediction and not with the pregnancy, they will often be saved anxiety. Frequently such discrepancies are attributable to a false assumption, for our rule always assumes that the conception took place immediately after a menstrual period. While this is generally true, the number of cases in which it occurs just before the period to be missed is by no means inconsiderable, and in these we should not expect pregnancy to end until two or three weeks after the day predicted by the rule.
Occasionally patients know the precise day upon which conception took place, and prefer to estimate the day of confinement from that rather than from the beginning of the last menstruation. They may do so by counting back thirteen weeks from the day of conception; but this method also is subject to error for, as we have noted, the duration of pregnancy reckoned in this more exact manner is not constant. Such a calculation rarely offers any advantage over that made from the menstrual record.
Another method of estimating the date of confinement is based upon the assumption that fetal movements are first perceived by the mother toward the eighteenth week of pregnancy; and in consequence twenty- two weeks generally elapse between quickening and the day of delivery. Although such a calculation is far from certain in its prediction, there are instances in which no other calculation can be made. A nursing mother, for example, may become pregnant before menstruation has been reestablished. Under these circumstances, obviously, the date of confinement cannot be estimated in the ordinary way, and it is then especially important to know the first day on which the fetal movements were felt. Furthermore, it is helpful to note this date in every case, since it serves, if for nothing more, to confirm the prediction made from the menstrual record. Besides the two methods just described, which are alike in that they require the patient herself to make the necessary observations, there is a third method of estimating how far pregnancy has advanced, by which the physician is enabled to draw his own conclusions. This method is based upon the fact that the womb enlarges from month to month during pregnancy at a constant rate. Up to the end of the third lunar month it cannot be felt through the abdominal wall; but in the course of the fourth month, on account of its size, it must rise into the abdominal cavity. At the beginning of the sixth month the top of the womb is at the level of the navel, and at the ninth reaches the ribs. The diaphragm then prevents the womb from going higher; and two or three weeks before the end of pregnancy it drops several inches, causing a change in the figure which is noticeable to the patient, since her skirts hang somewhat lower than before. From this time on she is more comfortable, because the lungs are not crowded, and there is less interference with breathing.
These alterations in the position of the womb indicate very satisfactorily the month to which pregnancy has advanced, but not the week and much less the day. They do not afford a more accurate means of predicting the date of confinement than does quickening. The evidence gained from the position of the womb, like that afforded by the beginning of quickening, generally confirms the prediction made from the menstrual history; it serves only occasionally to correct it.
PROLONGED PREGNANCY.—Since birth does not occur in many cases until the predicted date has been passed, it will be helpful even at the cost of repetition to sum up what we know in explanation of such unfulfilled predictions. They are to be explained sometimes by uncertainty as to the beginning of pregnancy, as for example by the supposition that conception took place shortly after the last menstrual period, whereas it actually occurred two or three weeks later. In a few instances, however, errors of observation or of calculation will not account for false predictions.
It is generally admitted that second pregnancies average somewhat longer than first pregnancies; one series of statistics indicates that the duration increases slightly with each pregnancy up to the ninth and decreases after that. Pregnancy is protracted more frequently in healthy women than in those who are not, and again more frequently in those who are inactive than in those who work. With twins, contrary to the popular belief, pregnancy is apt to end before, not after, the expected date. The sex of the child, in all probability, has no influence upon the duration of pregnancy.
As we might expect, individuality is also a factor in this problem. Thus, the period of gestation with some women is regularly longer, with others habitually shorter than the accepted average. Until experience has demonstrated their existence, generally, such peculiarities are overlooked. But occasionally they may be detected from knowledge of the interval between the menstrual periods; an unusually long interval between them, for example, would lead us to anticipate a protracted pregnancy.
Any delay after the expected date of birth has arrived taxes the patience of the prospective mother. The fact, however, that more than 280 days have passed since the last menstruation, does not necessarily mean that a patient has gone "over time." Such a question can be decided solely from the weight and length of the child. Judged in this way, comprehensive statistics indicate that once in several hundred cases pregnancy may be fairly called prolonged. Even in these rare instances an examination about the time of the predicted date makes it clear whether pregnancy should be artificially ended or be allowed to proceed to its natural conclusion.
CHAPTER II
THE DEVELOPMENT OF THE OVUM
The Germinal Cells—Fertilization—The First Steps in Development—
The Reaction of the Uterus—The Amniotic Fluid—The Placenta—The
Umbilical Cord.
Pregnancy, besides changing the external form of the body, causes sensations—as for example those due to fetal movements—which are so distinctive that they cannot escape notice. These obvious evidences of approaching motherhood naturally lead thoughtful women to wonder about the hidden mechanism of development, a mechanism which, of itself, causes no sensation whatever. It is for this reason, perhaps, that a prospective mother's imagination is so apt to be unusually active, often picturing absurd conditions as responsible for one symptom or another. Those who give free play to the imagination in regard to the formation and progress of the embryo are pretty certain to arrive at erroneous if not grotesque conclusions; for example, they may attribute a protracted pregnancy to the child's having grown fast to the mother, a situation that cannot arise.
Of course it is not essential that a prospective mother should understand what is happening within the womb. And upon those who prefer to be ignorant of the mechanism of development I would not urge another point of view, for not ignorance but the unchallenged acceptance of "half-truths" and of totally incorrect explanations is the chief source of harm. On the other hand, my own experience has taught me that women who wish to know about development should be told the truth. In accord with this is the fact that I never have more satisfactory patients than those who have previously been trained nurses and who, in preparing for that profession, received instruction concerning the reproductive function of human beings.
A description of development, in order to be perfectly clear, must begin with a word about the fundamental structure of the adult body. Everyone knows that the various parts of the body perform different functions; but not everyone, perhaps, realizes that, in spite of their different functions, all the organs of the body are composed of similar structural units, known as cells. Of course, cells are definitely arranged according to the use for which the tissue that they chance to compose may be designed; they have, moreover, distinctive individual peculiarities which can be easily recognized under the microscope; but the essential features of the cells remain the same, wherever they may be located. That is to say, each cell is a minute portion of living matter, or protoplasm, separated from its neighbors by a partition, the cell-membrane; each has its own seat of government, the nucleus, located near its center; and each, to all intents and purposes, leads an individual existence.
THE GERMINAL CELLS.—Many of the cells in the human body are able to produce others of their kind. This they do virtually by growing and splitting in half; cell-division, as this splitting is called, really represents reproduction reduced to the simplest terms. Most cells can do no more than produce units like themselves. The bodies of women contain, however, a type of cell which possesses a far more wonderful power. Provided the requisite conditions for such development are met, these cells are capable of developing into human beings. Each of these remarkable units is called an Ovum, or egg-cell, and represents one variety of the germinal cells. But the other variety, represented by the Spermatozoon and developed only in the male sex, is also required for the production of a human being.
Every ovum originates in the ovaries. These are organs peculiar to women, having the size and shape of large almonds, and placed in the lower part of the abdominal cavity. Though the ovaries are two in number, one alone is sufficient for every requirement of health. It has been estimated that the ovaries together contain at the time of birth about 40,000 ova, distributed equally between them. Since less than 500 ova are required to insure regularity in the menstrual function, it is clear that, if the surgeon finds it necessary to remove one of the ovaries, the other will provide abundantly for menstruation and for the bearing of children. Although every ovum that will be produced as long as a woman lives has already sprung into existence by the time she is born, not a single one ripens for from twelve to fifteen years. The ripening process begins about the time of puberty, and, unless suspended through the occurrence of pregnancy, continues until the menopause. During this period, which is also characterized by the periodical appearance of menstruation, one ovum ripens each month; sometimes, though rarely, several ripen at once, and this tendency is partly responsible for twins.
The human ovum is a tiny structure, measuring about 1/125 of an inch in diameter. With the naked eye it can barely be seen; magnified by the microscope it appears as a little round bag made of a transparent membrane. Briefly described, the ovum is a single cell. That is, it belongs to the simplest class of anatomical structures, and is one of the millions upon millions of units that make up the body. It contains a nucleus surrounded by nutritive material, the yolk. Yet the quantity of yolk is exceedingly small. In this particular the human ovum differs notably from the egg of birds, as it does also in that it lacks a shell. Obviously, a shell would not only be useless to an embryo developing within the body of its parent, but would shut off the nourishment, which, since the ovum contains so little, must necessarily be provided by the mother.
When the ovum has ripened, it becomes detached from the ovary, and enters a fleshy tube about the size of a lead pencil, known as the oviduct. There are two of these tubes, one running from the neighborhood of each ovary; both enter the uterus, but on opposite sides. The ovum travels down the tube which corresponds to the ovary where it originated. The journey is fraught with momentous consequences, for it is during this passage through the oviduct that the fate of the ovum is determined. If it is to develop into a living creature, a great many conditions must sooner or later be fulfilled; but there is one which must be promptly satisfied. Shortly after leaving the ovary the ovum must receive the stimulus to live and grow; otherwise it will quickly wither and die. This vital stimulus can be imparted only by the spermatozoon.
The male germinal cell is like the female cell in the possession of a nucleus; in other respects it is very different. Longer but much narrower than the ovum, the tiny arrow-shaped spermatozoon is particularly distinguished by its active motility, for it has a tail that propels it. The human male cell must travel some distance to reach the point where it can meet a ripe and vigorous ovum; and since the journey is not without danger to its life, Nature has provided that exceedingly large numbers of the male cells shall be deposited in the vagina at the time of the marital relation. In this way, it is made sure that some of them will travel up through the uterus and oviducts, arriving in the neighborhood of the ovaries.
FERTILIZATION.—Convincing observations upon the lower forms of life, especially upon fishes, have shown that when the germinal cells come near to each other, the ovum attracts the spermatozoon. The power of attraction which the ovum exerts may be likened, most simply, to the influence of a magnet upon iron-filings. While there has been no opportunity to observe such attraction between the parent cells of human beings, its existence is not open to doubt. And it is practically certain that these cells meet in the oviduct, even in that portion of it which receives the ovum just as it leaves the ovary. Thither a number of the male cells have traveled by their own activity; several come in contact with the ovum and one, but only one, actually enters it. Almost at the moment when they touch, the two cells unite so intimately that all trace of the spermatozoon is lost. Fertilization of the ovum, as this event is scientifically termed, has as its main purpose the uniting of the nucleus of a male germinal cell with the nucleus of the female germinal cell. This detail has been carefully studied; we know that the nuclei quickly blend into one, and that the particles of living matter contributed by the male animate the female cell with a new and wonderful activity.
In our every-day way of speaking, fertilization means conception; it is the instant in which a living being begins its existence. There is no longer the slightest excuse for confusion regarding the period at which the life of the unborn child begins. Before the significance of fertilization was understood, it was perhaps not unreasonable to believe that life began with quickening or about the time the fetal heart-sounds could be heard. But now we must acknowledge that both these ideas were incorrect. The animation of the ovum at the moment of conception marks the beginning of growth and development which constitutes its right to be considered as a human being.
Individuality, hereditary traits, sex—all these, we may be sure—are unalterably determined from the moment of conception. The germinal cell forms the total contribution of the male parent to pregnancy; therefore no other opportunity for him to influence his progeny presents itself, and the substance which enters the ovum at the time of fertilization must be the basis of inheritance from the father. It is equally true, as we shall see in the next chapter, that the nucleus of the ovum and the nucleus alone transmits maternal qualities. The material which conveys inheritable characters can be seen and has been identified in both germinal cells; from each of them the fertilized ovum derives equal amounts. As the parental nuclei unite, the material which they contain intermingles and establishes a new being; to attain full development, it requires nothing further from the father, and nothing save nourishment from the mother.
THE FIRST STEPS IN DEVELOPMENT.—Although the identity of the spermatozoon is lost at the moment of fertilization, its influence just then begins to be asserted. In the fertilized ovum the dawn of development is shown at first by unusual activity within and later by alterations upon the surface. Before very long the circumference of the cell becomes indented as if a knife had been drawn around it, and shortly two cells appear in place of one. These two cells in turn divide, yielding four cells which grow and divide into eight. In this manner division follows division until a multitude of cells have sprung into existence, all of which cling together in the shape of a ball. Development always proceeds in the same orderly way; evidently it is governed by fixed laws which decree that the mass shall remain for a while in the form of a ball, though the ball, at first solid, soon becomes hollow.
While these changes are taking place the growing ovum is carried down the oviduct a distance of four to six inches and finally comes to rest in the uterus, where it is to dwell during the months necessary to its complete development. The time consumed by this journey cannot be measured accurately; it may be as short as a few hours or as long as several days, but in all probability it is never longer than a week. Although the element of time is uncertain the method of transmission is well understood. Of its own accord the ovum can move after fertilization no better than before; it is never capable of moving itself. The active agent of transportation is the oviduct, which has been fitted for this purpose with millions of short, hair- like structures that project into its interior. These are closely set upon the inner surface of the oviduct; their outer ends are free and continually sway to and fro like a wheat field on a windy day; and by their motion they create a current in the direction in which the ovum should move, namely, toward the uterus. While passing through the oviduct, the ovum has no attachment whatever to the mother, yet development is going on all the time. It is thus made perfectly clear that development is not directed by the parent. This independence of the parent, though it continues to be one of the characteristic features of the development of the ovum, shortly becomes less evident, for communication is set up between the mother and the ovum as soon as it reaches the uterus. Unless we were warned, we might easily misinterpret the significance of this attachment to the parent. It does not permit the mother, for instance, to influence the mind or character which the child will have. The purpose of the attachment is twofold, namely, to anchor the ovum, and to arrange channels by which, on the one hand, nutriment may reach the embryo, and, on the other, its waste products may return to the mother. The mother may influence the nutrition of the fetus; but she cannot determine the kind of brain or liver her child will have; neither for that matter can she alter the development of any portion of the embryo.
After its entrance into the cavity of the uterus prepared to receive and protect it, the mass of cells sinks into the soft, velvety lining of the organ. Here it is entirely surrounded by tissue which belongs to the mother. But just before implantation takes place the architecture of the ovum is modified in such a way as to indicate the trend of its subsequent development. We left it, a hollow ball passing down the oviduct; had we examined the sphere more closely we should have found its wall composed of a single layer of cells. At one spot, however, the wall soon thickens. The thickening is due to a specialized group of cells which gradually grows toward the hollow center of the ball. A little later, if we study the structure as a whole, we find it a small, distended sac, from the inner surface of which hangs a tiny clump of tissue. The clump of cells within and the inclosing sac as well are both requisite to the ultimate object of pregnancy; yet they fulfill very different purposes. The clump within will mold itself into the embryo; the inclosing sac will make possible the continued existence and growth of the embryo by securing and conveying to it nourishment according to its needs. These two structures, which from now on constitute the ovum, can best be considered separately and in the order of their development. We shall therefore first study the sac and in the next chapter the embryo.
For a time after this sac, or ball, as you may choose to think of it, becomes implanted in the uterus, every part of its wall shares in the responsibility of procuring nourishment for the embryo. On this account the wall, or capsule, is for several weeks the most conspicuous part of the ovum. Its position is naturally advantageous, for, since it forms the outermost region of the structure and comes into immediate contact with the tissues of the mother, it has the first opportunity to seize and appropriate nutriment. Consequently, while there is still relatively little development in the embryo, the capsule of the ovum gives evidence of rapid extension; the wall becomes thicker, and the circumference of the sac increases. The significant thing about this growth, however, is the fact that it does not progress evenly. At some points cell-division is more active than at others, with the result that the surface of the ovum speedily loses its smooth, regular outline. Projections from the capsule appear; they increase in number and in length; and by the end of four weeks the ovum, as yet less than an inch in diameter, resembles a miniature chestnut-burr. To make the comparison more accurate, we must imagine such a burr covered with limp threads instead of rigid spines.
These projections, the so-called Villi, push their way into the mucous membrane of the uterus and serve a two-fold purpose. One of their functions is to fix the ovum in its new abode; and, though the attachment is not at first very secure, it becomes stronger in the course of time and is capable of withstanding whatever tendency the activity of daily life may have to loosen it. The other, and equally important, task of the villi, the majority of which dip into the mother's blood, is to transmit substances to and from the embryo.
We have traced thus far the earliest steps in the development of the ovum. One portion, we observed, was promptly set apart for the construction of the future child; this favored portion became inclosed by all the rest of the ovum, which has a more or less spherical form and is technically called the fetal sac. The first duty of the sac is to take root in the womb, and the second, no less vital, is to draw nourishment from the mother. But neither of these functions can be performed without the participation of the uterine mucous membrane, the soil, as it were, in which the ovum is planted. We must now learn how the maternal tissues assume the responsibility placed upon them.
THE REACTION OF THE UTERUS.—The womb, which is small before marriage, is converted by pregnancy into the largest organ of the body. The virginal uterus, shaped somewhat like a pear, and placed with apex downward, is carefully protected within the bony basin between the hips, which is commonly called the Pelvis. The upper and larger part of the organ, known as the body, lies at the bottom of the abdominal cavity; the lower part, the neck, projects into the vagina. The cavity inside the womb communicates above with the two oviducts and terminates below in a canal which runs through the neck and opens into the vagina by an orifice known as the mouth of the womb.
Pregnancy modifies every portion of the womb in one way or another; but the most profound alterations occur in the body, in the cavity of which the ovum has come to rest. During the forty weeks of gestation the organ grows in weight from two ounces to as many pounds; from three inches in length it increases to fifteen inches; and its capacity is multiplied 500 times.
The mucous membrane which lines the cavity of the uterus responds to the stimulus of pregnancy in a characteristic manner and with a single purpose, namely, to promote the development of the ovum. In connection with menstruation we noted that this membrane periodically prepares for the reception of an ovum. And if the expected ovum has been fertilized, its arrival is followed by arrangements for its protection and nutrition which are far more elaborate than the preparations for its reception. Within a few weeks the mucous membrane becomes half an inch thick, that is, about ten times thicker than it was; and all the elements entering into its composition, become unusually active. The blood-vessels are congested; the glands pour out a more elaborate secretion; and certain cells lay up a bountiful store of material to be drawn upon in the formation of the embryo and the building up of the structures that promote its development.
The ovum is as likely to find a resting place at one spot as another upon the surface of the uterine mucous membrane. The whole of that surface has been made ready to receive it; yet the area actually required to imbed the tiny object is extremely small. As the ovum escapes from the oviduct and enters the womb, it is smaller, in all probability, than the head of a pin. For at least a week after its coming, diligent search is necessary to find the site of implantation. Insignificant as it is at first, however, the region of implantation later becomes very prominent, for it undergoes a transformation that the rest of the mucous membrane does not share. That is to say, it becomes the point of attachment of the Placenta, an organ that has the very important function of drawing upon the resources of the mother's blood. As the ovum sinks into this especially prepared bed, the villi are formed. They break open the adjacent capillaries of the mother, thus diverting her blood from its accustomed course. The blood collects in microscopic lakes in contact with the capsule of the ovum, and from them flows back into the mother's veins. Through the veins it returns to her heart, by which it is distributed through the arteries to the various regions of the body. The tiny lakes, in which the villi hang, are thus made a part of the mother's circulation and as such are regularly replenished with purified blood. By this means the ovum receives a rich supply of nutriment, and as a natural consequence its growth is rapid.
Before very long the diameter of the ovum is greater than the depth of the mucous membrane which surrounds it. Consequently that part of the membrane which covers it is pushed into the uterine cavity, as the ground is raised by a sprouting seed. Growth continues, the bulging increases, and extensive alterations are wrought both in the womb and in the capsule of the ovum. One of these alterations will be more easily understood if we still think of the ovum as a seed, for it grows away from its roots just as plants do. Most of the capsule, therefore, is removed step by step farther from its source of nourishment, for the maternal blood-vessels do not follow the expanding sac but retain their original position at its base. Partly on account of the lack of nutriment thus occasioned and partly on account of the distention caused by the contents of the sac, atrophy occurs in the distant portions of the sac's wall. As a final result of these two factors, the maternal tissue which covers the ovum becomes thinned and stretched; it is pushed entirely across the uterine cavity; and by about the twentieth week meets the opposite side of the cavity, to which it becomes adherent. Subsequently, the sac which incloses the embryo becomes everywhere fastened to the inner surface of the uterus and completely fills the uterine cavity.
THE AMNIOTIC FLUID.—The great enlargement of the uterus which is so marked a characteristic of the latter part of pregnancy is due in a measure to the luxuriant blood-supply, for better nutrition always causes growth. In a far larger measure, however, it is due to distention for which the product of conception is responsible. Beside the fetus the inclosing sac also contains a considerable quantity of fluid. This fluid, called "The Waters" by those who have no special knowledge of anatomy, is technically designated as the Amniotic Fluid.
In the earlier months of pregnancy the amniotic fluid is not abundant; later it increases rapidly, so that by the end of the period it measures about a quart, and frequently even more. The slightly yellow amniotic fluid is itself clear, but small particles of dead skin and other material cast off from the surface of the child's body are floating in it, and may cause turbidity. The absence of odor supports the view that this fluid is not the child's urine. The evidence thus far adduced, though not absolutely conclusive, gives good reason to believe that "the waters" are secreted by the inner side of the sac which incloses the fetus. Very early in pregnancy this sac becomes a double-walled structure; and, though its layers are intimately blended, and together measure not more than 1/16 of an inch in thickness, with a little care they can be separated. The outer layer, which comes in contact with the inner surface of the uterus and has to do with the matter of nutrition, is called the Chorionic Membrane; the inner, the so-called Amniotic Membrane, is much the stronger and is devoted to the protection of the embryo, which it completely surrounds with fluid, at the same time retaining the fluid within set bounds.
The amniotic fluid performs many important duties. Perhaps the first, in point of time, is to provide sufficient room for the embryo to grow in. Later, as the fluid increases, it permits the fetus to move freely, and yet renders the movements less noticeable to the mother. Again, the amniotic fluid prevents injuries that might otherwise befall the child in case the mother wears her clothing too tight. Harmful as the practice of tight-lacing during pregnancy is, it does not, thanks to the presence of the amniotic fluid, result in the disfigurement of the child. For the same reason a blow struck upon the abdomen, as in a fall forward, is not so serious as might be thought, since the fluid, not the child, receives the force of the impact. Some physicians believe that the fetus swallows the amniotic fluid and thus secures nourishment. The fluid also serves to keep the fetus warm; or, to be more exact, protects it from sudden changes in the temperature of the mother's environment. Normally the temperature of the fetus is thus kept nearly one degree higher than the temperature of the parent.
Ultimately, the amniotic fluid assists in dilating the mouth of the womb, which remains closed until the beginning of the process that terminates with birth. The uterine contractions at the onset of labor compress the fluid; in turn the fluid attempts to escape but is held in check by the amniotic membrane, which it drives into the canal leading from the uterine cavity to the vagina. Acting like a wedge, the fluid gradually pushes the mouth of the womb wider and wider open, until it is large enough for the child to pass. The sac usually ruptures when that point is reached, the fluid escapes, and in due time the child is born. This is followed within half an hour by the extrusion of a mass of tissue—in reality the collapsed fetal sac— which in every language, so far as I know, is named the After-Birth. An examination of this tissue at the time of delivery repays the physician, for it is important to ascertain that none of it has been left in the uterus. Our interest at present, however, is to learn how the after-birth has assisted toward the growth of the child.
THE PLACENTA.—The after-birth has puzzled scientists as well as the laity, and not until comparatively recent times have its origin, structure, and use been satisfactorily explained. Its meaning profoundly interested primitive men and stimulated their imagination scarcely less than the mystery of conception. Some uncivilized tribes believed that the after-birth was animated like the child; consequently they spoke of it as "the other half," and often saved it to give to the child in case of sickness. But generally the after- birth was buried with religious ceremony, and was occasionally unearthed later to discover whether the woman would have other children; the prophecy was made according to the manner of disintegration or some other equally absurd circumstance.
The after-birth consists of a round, fleshy cake, the placenta, to which two very essential structures are attached. One of these, running from one surface of the cake, is a rope-like appendage, the umbilical cord, which links the placenta with the fetus. The other, attached to the circular edge of the cake, is a thin veil of tissue, in some part of which a rent will be found. Now, if we lift the margin of the rent, we shall see that the veil and the cake together form a sac which we are holding by the opening. This aperture through which the fetus passed, and it was really made for that purpose, was formerly placed over the mouth of the womb; the sac itself, distended by the fetus and the amniotic fluid, was fastened everywhere to the inner surface of the womb.
It is plain that we have now in our hands the fetal sac, the development of which we have already traced from the beginning. The wall of the sac, it will be recalled, was originally of the same formation throughout; but when the ovum became imbedded in the womb, that part of its capsule which remained in permanent contact with the mother's blood underwent special development, whereas the rest of the capsule gradually pushed away from its primary position and, becoming stunted in its growth, even lost to some degree the development it had attained. This latter portion, the veil that passes from the edge of the placenta, is formed of the two membranes we have mentioned, namely, the chorion and the amnion.
The placenta is, for the most part, a highly developed portion of the chorionic membrane, which became specialized simply because it happened to receive the best supply of blood. At the time of birth the placenta measures nearly an inch in thickness, is as large around as a breakfast-plate, and generally weighs a pound and a quarter, that is, approximately one-sixth of the weight of the child. This relation between the weight of the placenta and of the child is regularly maintained; therefore, the larger the child the larger the placenta associated with it.
The placenta has two surfaces, easily distinguished from each other. The raw maternal surface was formerly attached to the inside of the uterus; the fetal surface, covered by the amniotic membrane, was in contact with the amniotic fluid. Across the fetal surface run a number of blood-vessels containing the child's blood, converging toward a central point at which the umbilical cord is inserted. The point at which the cord is attached affords the simplest means of distinguishing the two surfaces of the placenta.
Our knowledge as to how the exchange of food and excretory products between mother and child is carried on by the placenta has been gained chiefly through the microscope. The oldest medical writings, as we might suppose, express very fanciful ideas regarding the nature of embryonic development and the means by which it is made possible; no rational view of these matters could exist until the circulation of the blood was described by William Harvey in 1628. After this epoch-making revelation, it was accepted as true that the mother's blood entered the unborn child and returned to her own system. But that view eventually became untenable, for it was proved conclusively that there is no communicating channel between the two. For years after that, it was believed that before birth the womb manufactured milk to sustain the child, just as the breasts do afterwards; but this theory also was disproved; and, as I have said, only by the use of the microscope have we learned the truth about fetal nutrition.
When thin slices of the placenta are magnified they are found to contain countless numbers of tiny, finger-like processes; these are the villi, and they constitute the major portion of the organ. The villi seen in a mature placenta are the same as those which projected from the capsule of the young ovum, but not these alone, for many branches have sprouted from the original projections. The primary trunks with all their branches hang from the capsule of the ovum and extract nutriment from the mother's blood which surrounds them, just as the roots of a tree extract it from the soil.
The interchange of material between mother and child as carried on in the placenta can, perhaps, be made clearer if we compare one of the trunks and its branching villi to a human forearm, hand, and fingers. The hand, we will imagine, is held in a basin of water, in which, by turning on a spigot and leaving the outflow unstopped, we have arranged that the water changes constantly. In terms of this illustration, the water corresponds to the mother's blood, rich in oxygen, mineral matter, and all other kinds of essential nutriment; and the fingers are the villi. The blood-vessels in the fingers, to go a step farther, represent the blood-vessels which exist within the villi, connecting with the umbilical cord, and passing by that route to the body of the child. The blood which thus circulates through the villi, it is important to emphasize, is the child's blood; it cannot escape through the coating of the villi, just as our blood cannot escape through the skin of the fingers. Similarly, the mother's blood cannot enter the child; the two circulations are absolutely separate and distinct.
It must be noticed, moreover, that the maternal blood not only brings to the surface of the villi everything the child needs, but it also takes away the waste products of fetal life. Let us select one of the foodstuffs necessary for the unborn child, and follow its course so far as it relates to fetal nutrition. The mother's blood brings sugar, for example, from her intestinal tract to the surface of the villi; through the coating of the villi the sugar passes into the fetal blood, is carried to the fetal heart, and distributed to the various fetal organs. They burn it, deriving heat and energy, and in return give off waste products, namely, carbonic acid gas and water, which are taken up by the fetal blood, borne back to the placenta, and pass again through the coating of the villi into the mother's circulation. These waste products are then transported to the mother's lungs and to her kidneys, and are finally thrown off from her body. Before the child is born, therefore, the placenta, which is an aggregation of villi, acts as its stomach, intestines, lungs, and kidneys.
In every pregnancy the placenta serves in this way as an organ of nutrition, arranging for the passage of food from the mother's blood to the fetal circulation. Occasionally, it is interesting to observe, the placenta performs a very different function, namely, the protection of the unborn child from diseases that may attack the mother. It is able to afford such protection, because the coating of the villi is not permeable to all sorts of substances. In order to pass through their walls, material must be in solution; solid bodies, therefore, are denied admission to the fetal circulation. The most significant result of this restriction is, perhaps, that so long as the coating of the villi remains intact and healthful, bacteria cannot gain access to the unborn child. Since in health there are no bacteria in the mother's blood, this fact has no bearing upon the average pregnancy; but in those exceptional cases in which typhoid fever or some other infectious disease appears during pregnancy, it is gratifying to know that Nature has provided an unusual defense against infection of the unborn child.
That we do not know all about the interchange of substances between mother and child must be admitted; but the essential facts, and they alone are of interest here, have been established beyond contention. There is no doubt whatever that the mother's blood surrounds the placental villi but never enters the child. The fetal blood, on the other hand, is first in the child's body, then in the villi, and then returns to the child again. It never enters the blood-vessels of the mother but passes to and from the placenta as long as pregnancy lasts.
THE UMBILICAL CORD.—This rope-like structure, familiarly known as the navel-string, which connects the placenta and the fetus, is approximately twenty inches long; its length, therefore, is sufficient to permit the newly born child to lie between the mother's knees while the placenta remains attached to the womb. The cord is about the thickness of the thumb and contains three blood-vessels, all filled with fetal blood; in two of them the current is directed toward the placenta, the third carries the blood back to the fetus after it has circulated through the placental villi. In the cord the vessels lie near together and are encased in a jelly-like substance that protects them from injury.
So far as is known; the umbilical cord performs no service other than to link the blood-vessels in the placenta with those in the fetus. Simple as this may seem, it is of paramount importance in maintaining the life of the fetus, for compression of the vessels in the cord would shut off its nutriment. Against such accident, however, perfect provisions have been made; both the amniotic fluid and the jelly-like substance which surrounds the vessels are safeguards which effectually protect the circulation from pressure that might interrupt it.
Frequently, prospective mothers are told they must not "reach up" for fear the cord will become entangled. Such a precaution is quite unnecessary. No matter what the mother does, or does not, the cord will be found around the child's neck at the time of birth in one of every three cases. It is not difficult to understand how this happens. The cord is longer than the uterine cavity and must fall in coils toward the bottom of it. Now, since the fetus is free to move it enters and withdraws from these loops, many times, in the course of pregnancy. Finally, when it takes up a position head downward, as it nearly always does, the head is the part of the fetus which passes through the coil, should one happen to lie in its path. After the head is delivered the physician always feels about the neck to discover whether a loop of cord is there. If it is, he can release it easily. This condition, since it occurs so frequently and since it so rarely produces harmful consequences, should not be considered unnatural.
After the child is born, the physician cuts the cord, and in due time the after-birth is expelled through the same passage as was the child. The expulsion of the after-birth frees the mother of all the tissue derived from the growth of the ovum, for the intricate mechanism that served to nourish and protect the embryo was almost entirely developed from the ovum itself. It is a remarkable provision of Nature that very little of the mother's tissue is cast off at the end of pregnancy; and even this small portion is promptly replaced. By about the sixth week after delivery, the wound which was made by the separation of the fetal sac has completely healed. Meanwhile the mucous membrane that underwent elaborate preparations to receive the ovum, the cavity that was adjusted to its growth, and the muscle fibers that were strengthened to insure its safe entry into the world have all regained their original state. Except for the activity of the breasts, the mother is left in the same physical condition as before she became pregnant.
CHAPTER III
THE EMBRYO
The Development of Form—The Determination of Sex—Twins—The Rate of Growth—The Newborn Infant—Heredity—Maternal Impressions.
The new human being begins existence, as I have shown, as soon as the ovum is fertilized, though at that moment it consists merely of a solitary cell formed by the union of the two parental cells. From a beginning relatively simple the human body develops into the most complex of living structures; and, startling as it may appear to be, it is demonstrably true that every one of the millions of cells which compose an adult has descended from the ovum. Furthermore, the individual himself is not the entire progeny of the ovum; the placenta and the membranes dealt with in the preceding chapter, we saw, were also derived from that same source. They possess only a transitory importance, to be sure, and to most persons they are less interesting than the embryo, yet we gave them consideration before discussing its growth because the manner in which the ovum becomes attached to the womb and draws nutriment from the mother primarily determines the fate of a pregnancy.
Now that we have become familiar with the arrangements for the protection of the embryo, we are prepared to learn how it develops, and may accept the phrase, embryonic development, to cover the whole period of existence within the womb. In a more technical sense, however, the use of the term embryo is limited to the first six weeks of pregnancy and designates the condition of the young creature before it has acquired the form and the organs of the infant; after that time the unborn child is called a fetus. Embryonic development, therefore, in the strictest sense of the term, chiefly involves the shifting of various groups of cells and the bestowal upon them of different kinds of activity. During this period comparatively slight growth takes place. By about the twentieth week, the house, it may be said, is set in order; and there follows a period marked by the rapid growth of the fetus.
THE DEVELOPMENT OF FORM.—A very old explanation of embryonic development was that the process consisted altogether in growth. According to that view the embryo lay curled up in the egg; at the outset it was equipped with organs, limbs, features, and all the other bodily structures found in an adult. In order that the ovum might be transformed into a mature infant, only unfolding and growth were required. After the microscope came into use, however, so simple an explanation could no longer be accepted. Scientists soon realized that the embryo did not exist "ready made" in the ovum, which, even when magnified, failed to bear the faintest likeness to a human being.
Although the microscope made impossible this very simple explanation, it gave in return a truer, if more complex, account of the transformation from egg to offspring. By this means it has been definitely proved that the ovum multiplies rapidly after it has been fertilized, and becomes, as was explained in the preceding chapter, a sac-like structure within which hangs a tiny clump of tissue. This inner mass of cells forms the embryo.
It has proved a difficult task to secure very young human embryos, and many of the ideas we hold relative to the initial stages in the development of man are based upon what has been found true in certain mammals, the class of animals to which we belong. The youngest human ovum known at present has already undergone about two weeks' development, and there the embryo is represented by a flat disk. From this stage to the stage of complete development a satisfactory series of embryos has now been collected, but it is impossible to give here, even in outline, a description of the evolution of the human embryo. No one can understand this intricate subject without the aid of diagrams, models, and other material beyond the reach of all save laboratory workers.
By the end of the second month the development of the embryo has advanced so far that anyone could recognize its human shape. About that time, too, the external sexual organs make their appearance. At first these are quite similar in both sexes; and, if they are used as the criterion, it is possible only toward the end of the third month to say whether the embryo is a male or female.
THE DETERMINATION OF SEX.—The fact that a number of months pass before the sex can be distinguished by an external examination of the fetus has led to the erroneous belief that it can be influenced during the early part of pregnancy or actually determined at will. Various means to accomplish this have been suggested; many of them depend upon modifying the mother's mode of living according as a boy or girl is desired. The most widely known of these doctrines, that of Schenck, was to the effect that the sex of the offspring is always that of the weaker parent. He suggested, therefore, that increasing the vigor of the mother by an appropriate diet would produce a male child, whereas a decrease in her strength would lead to the opposite result. His views, however, were incorrect. After studying extensive statistics Newcomb came to the conclusion that "it is in the highest degree unlikely that there is any way by which a parent can affect the sex of his or her offspring."
Moreover, the results of experimental research clearly indicate that we shall never possess the means by which a mother may control the sex of her child. In the main laboratory investigations have sought to answer two questions. First, at what time is the sex of the offspring determined? and, second, what accounts for the origin of a male in one instance and of a female in another? The study of these problems has been carried on chiefly in connection with insects, worms, and fowl; but as yet insurmountable difficulties have prevented similar investigations in higher animals. For this reason, it is not without the greatest caution that results thus far obtained may be assumed to apply to man.
Sufficient facts, however, have been collected to admit no doubt regarding the answer to the first question. In most animals it is definitely known that the sex of the offspring has been fixed when the male cell enters the female cell, in other words, at the instant the ovum is fertilized. Excellent reasons exist for believing that human beings conform to this rule, and that the sex of the child is unalterably determined at the moment conception occurs. Consequently, any attempt to influence it after that event must prove futile.
For the present, the second question cannot be answered with equal assurance. More than five hundred theories have been offered to explain the relation of sex; nearly all of them have no reasonable foundation and are only of historical interest. The view that girls are derived from the right ovary, boys from the left, has long since been disproven, and deserves mention merely because the laity still believe it. Happily, during the last few years, observations and experiments have been made which greatly advance our knowledge of the subject and give promise of an early solution of the problem. The controlling factor in sex determination has been narrowed down to three possibilities; it is inherited either from the single cell contributed by the father or from the single cell contributed by the mother, or it is determined by the effect these two cells have upon each other at the moment when they unite. In most animal species the weight of authority distinctly favors placing the whole responsibility upon the male cell.
According to recent evidence, there are two kinds of male germinal cells; one kind giving rise to female offspring and the other to male. In all probability, at the time of the marital relation, these varieties are deposited in the vagina in equal numbers; and, moreover, the mode of their production is such as to place absolutely beyond human control the possibility of changing this ratio. Since only one spermatozoon enters the ovum, whether or not the child will be a boy or a girl depends entirely upon which type gains entrance. If this explanation is correct, and it is in accord with careful biological observations, it removes from the mother all responsibility for the sex of her child. Furthermore, since the facts indicate that male-producing and female-producing spermatozoa are present in equal numbers, it follows that practically there is an even chance that an embryo will develop into a boy or a girl.
Birth statistics bear out this conclusion, as data gathered from many countries indicate that when long periods of time are studied 105 boys are born with a surprising regularity for every 100 girls. Thus, the records of Berlin, Germany, for a hundred years show that the maximum difference occurred in 1820, when the males outnumbered the females by 4.79 per cent.; the minimum difference, which was noted in 1835, was .64 per cent. in favor of boys.
No inquiry is more often submitted to the physician by prospective mothers than this, "Can you tell me if my baby will be a boy or a girl?" He cannot. Many rules, to be sure, have been advocated as safe guides toward reaching the correct answer; every midwife possesses her individual formula which she has "never known to fail." But the boastful success depends upon the application of some such method as the following, which I have heard my teacher, Dr. J. Whitridge Williams, expose to his classes. The patient is asked if a boy or girl is desired. She confesses, and is then informed that the sex of her child will be the opposite of her wish. When this guess proves to be correct, there is no doubt of the prophet's wisdom; when it is not, his honor is protected, for the parents have had their hope fulfilled. Their happiness makes them forgetful that the guess was wrong, or, for that matter, that it was ever made.
It was once believed that the sexes might be distinguished before birth by the number of heart beats occurring within a minute. In a general way, the action of this organ in females is somewhat more rapid than in males; and so it was thought that a rate of 144 or more indicated the female and a rate of 124 or less the male sex. But experience has taught that this rule leads to accurate prophecy in no more than half of the cases. As a matter of fact, no means of definitely foretelling the sex of the child has been discovered, and I doubt if it ever can be.
TWINS.—As every one knows, pregnancy commonly terminates with the birth of a single child. Twins appear in approximately only one of ninety pregnancies, while triplets are extremely rare. It is true that even quintuplets may occur, though up to 1904 only 29 authentic instances could be collected from the whole range of medical literature.
Twins are most frequently born to parents whose ancestors have established this tendency; the trait is usually inherited from the mother's family, though occasionally it is passed on through the father. Of course, that does not explain the cause of twins, which in reality may result from either of two circumstances. More commonly their genesis depends upon the ripening of two eggs at about the same time and the fertilization of both by two different spermatozoa. The children, in this instance known as double ovum twins, may be of the same sex or not. On the other hand, single ovum, or identical, twins are always of the same sex; this follows, since but one egg and but one spermatozoon are here concerned. The incident permitting twins to develop from a solitary ovum must occur soon after conception has taken place. It will be remembered that the first step in the development of the fertilized ovum consists in its dividing into two cells. Ordinarily, both these take part in the development of one embryo, but occasionally they separate and give rise to two. Frequently, the presence of twins can be recognized during the latter months of pregnancy, and accurate means are known of determining after they are born to which variety any given pair belongs.
THE RATE OF GROWTH.—When we recall the definite and often marked differences in the physical character of women, such as weight and height, it is surprising to learn that the prenatal development of their children proceeds with uniform speed. One very practical result is that the physician is thus enabled, at the birth of a premature infant, to estimate accurately the period of its development. Various criteria, some of which are easy of application, aid in this determination. For example, the length of the child is practically constant for each of the ten lunar months into which the whole gestation period is divided; if, therefore, the length of the newborn infant is known, the stage of its development can always be inferred. From the fifth month the calculation is especially simple, since the length measured in centimeters divided by the figure 5 gives the month to which pregnancy has advanced. Similarly, we can infer the period of development from the weight, though the calculation is more intricate and the method less reliable, inasmuch as the size of the child in the latter months varies somewhat according to the weight of its mother.
At the end of the fifth month, the weight of the fetus is from nine to ten ounces; whereas an average infant when born at the expiration of the full term of pregnancy, that is, with the completion of the tenth month, weighs about seven pounds. The fetus, therefore, acquires roundly ninety per cent, of its weight during the second half of pregnancy, which clearly indicates that Nature reserves this period of gestation for the fetus to increase in size, a phenomenon less mysterious but no less important than the evolution of the embryo.
Nothing is more valuable than the weight in affording an indication as to whether a prematurely born infant may be reared. It is unusual to raise a child weighing less than four pounds, which corresponds approximately to the end of the eighth lunar month of development (a trifle more than the seventh calendar month). After this time, the prospect of living becomes greater in proportion to the nearness with which the infant has approached maturity. No truth exists in the widespread belief that the seventh-month child is favored above that born later but before the natural end of pregnancy. Experience has taught that the probability of success in rearing the child increases rapidly after the seventh month. This is reasonable on the following somewhat theoretical grounds. The digestive organs later attain a higher state of perfection, and are better prepared to carry on their work satisfactorily. Moreover, the gradual deposition of fat beneath the skin during the last two months of pregnancy materially assists in fitting the child for the conditions met with in the external world, since the fat affords a barrier against the escape of heat generated within the body, making it much easier to keep the child's temperature at the normal point. Even other more technical reasons could be given to demonstrate the error of the superstition regarding the seventh-month child—a conviction endorsed by medical men hundreds of years ago and as yet not discarded by the laity.
When pregnancy has reached "term," the child, having completed its prenatal development, is ready to cope with conditions as they exist in the external world. At term the average child is twenty inches long and weighs 7 1/7 pounds (3,250 grams). The length is remarkably constant; but the weight, as is well known, is often somewhat above or below the average figure. In a general way, smaller children occur in the first than in subsequent pregnancies, and, moreover, may be expected when the mother is a small woman, or poorly nourished, or has worked hard during her pregnancy. On the other hand, a tendency to bear large children is present when the opposite conditions prevail. It is not unusual to see infants weighing eight or nine pounds at birth, but babies of more than ten pounds are rare, and the fabulous, though not infrequent, reports of fifteen and twenty-pound infants are probably not based upon actual weighings, but upon the impression of someone who has merely seen the child or perhaps guessed the weight from lifting it.
Although the fetus frequently changes its position during the earlier months of pregnancy, generally by the beginning of the tenth lunar month it has assumed a permanent posture. It has then reached such a size that it can best be accommodated in the cavity of the uterus if its various parts are folded together so as to give the fetus an ovoid shape. To secure this form its back is arched forward, and its head bent so that its chin touches its chest; its arms are crossed just below the head, its legs raised in front of the abdomen, and its knees doubled up. In this form the fetus occupies the smallest possible space.
With relation to the mother the position of the child, for several weeks before birth, is one in which its long axis is parallel to the long axis of her body. This remains true no matter whether the head or the buttocks are to precede at the time of birth. In ninety-seven out of a hundred cases, however, the head lies lowermost and consequently is the first portion of the child to be born. The opposite position, in which the head is the last portion born, is, even with the most skillful treatment, somewhat more serious for the infant, though not for the mother.
THE NEWBORN INFANT.—The baby at birth is not a miniature man. As compared with an adult its head and abdomen are relatively large, its chest relatively small; its limbs are short in proportion to the body; and at first glance it appears to have no neck at all. The middle point of a baby's length is situated about the level of the navel, whereas in a man the legs alone represent approximately half his height. The changes after birth consist chiefly in growth; but not altogether, since at least one organ, the thymus gland, becomes smaller and completely disappears during childhood, and other organs, especially the liver, are proportionately smaller in the adult than in the infant.
The body of the infant also differs from that of the man in possessing greater softness and flexibility. These qualities depend upon the nature of its skeleton, which is composed of more bones than later in life, when several have fused together to form one to give the mature body a more rigid frame. Furthermore, the individual bones are not so firm, consisting of an elastic material called cartilage, so that some movements which in an adult would cause such serious injuries as fractures and dislocations are perfectly harmless to a newborn child.
The legs are not only short in proportion to the body but are always curved, and the feet are held with the soles directed toward one another, a position clearly abnormal in the adult. But every mother should know that these are natural conditions in the infant, and are the result of the posture of the child before birth. They soon straighten out. The bowed legs of an adult are of an entirely different origin, resulting from a disturbance of nutrition in infancy called rickets.
A small amount of short wooly hair is usually found over the back of a newborn infant. More conspicuous, however, is the presence there of a gray, fatty substance which, though always more abundant over the back, is at times distributed over the whole body; rarely is it entirely absent. The material, technically named the vernix, is the product of the glands in the skin and is a perfectly normal secretion. After its removal, which is readily accomplished by greasing the infant with lard or vaselin before giving the initial bath, it never reappears.
A varying amount of hair covers the head of the infant. No significance should be attached to the quantity, for the conviction that exists, especially among negroes, that a heavy suit of hair for the child occasions "heart-burn" in the mother during pregnancy is without foundation. The color of the hair at birth does not indicate its ultimate shade; changes are often noted during infancy. Similarly the permanent color of the eyes is not assumed until later; at the time of birth the eyes are generally, if not always, blue in color.
A baby's head is a matter of great concern to the family. Occasionally, the skull is round and well shaped from the moment of birth, but more often it is long and narrow; sometimes the form is even startling to the inexperienced. The peculiar shape of the head results, of course, from its passage through the birth-canal and is not a sign of any disease. In a few weeks, or even less, the strange appearance passes away. It is unwise to attempt to alter the shape of the head by bandaging or massaging since the growth of the brain will spontaneously accomplish what is desired; interference can do no good, and may do serious harm.
Nature facilitates an appropriate molding of the head during birth so as to permit its easy passage through the bony pelvic cavity of the mother, and gains that end in two ways. The bones of the head remain pliable until after the infant is born, and, further, their edges are not welded together as in an adult, but are separated from one another by an appreciable distance. During the act of birth the edges are brought into contact or even overlap, materially reducing the size of the head. Within a few hours after birth the bones again spread apart, and some months elapse before they begin to unite; the union is not completed until some time during the second year of infancy.
Many mothers are anxious to know how far the senses of the infant have developed when it enters the world. This problem has stimulated some scientific investigation, though hardly so much as its interest would justify. Two lines of inquiry have been pursued toward its solution. The objective point of one of these has been to determine how nearly the sense organs of the newborn correspond anatomically to those of an adult; that is how perfectly has their organization been completed. The other has been to learn how the infant reacts when the various senses are stimulated; the interpretation of these reactions is, however, particularly liable to error and sometimes amounts only to guesswork.
The organization of the nerves and muscles in the eye is far from perfect at the time of birth. The muscles act irregularly; indeed, the lack of muscular adjustment is such that movements of the eye likely to alarm the parents are regularly observed in very young infants. Furthermore they cannot focus images which fall upon their eyes. The retina, which receives visual impressions, has reached such development at birth, however, that sensations of light can be perceived. For example, if a lamp is suddenly flashed before the face of a newly born baby it cries. From this and similar evidence, indicating that strong light irritates the delicate structures of the eye, we have learned that a nursery should not be illuminated, during the day or night, so brightly as the rooms adults occupy. Certainly several weeks, and probably several months, pass before an infant can see anything save as blurs of light and darkness. Objects, such as a hand, probably appear as shadows, which are not correctly interpreted until late in infancy.
In regard to color vision we have as yet no reliable information concerning children under two years of age. Infants of less than a year have been known to distinguish certain colored papers. But such discrimination is probably due to a difference in brightness of the colors.
Although the organ of hearing is well developed at birth, the drum of the ear in very young infants cannot transmit sounds, as in the adult. For the latter kind of transmission it is necessary that the pressure on both sides of the drum-membrane should be equal, and this is arranged by the admission of air to the middle ear through a passage from the throat. At the time of birth, on account of the swollen condition of the mucous membrane which lines this passage, it is blocked, and the middle ear is filled with fluid; these conditions interfere with the transmission of sound, and consequently its perception is dulled. But even in the absence of a drum-membrane an adult can hear; the vibrations in such cases are transmitted through the bones of the skull, and this very likely also occurs in newly born infants. In most instances, at least, they react to a disagreeable noise within the first twenty-four hours, and their sensitiveness in this direction explains why the nursery should be kept quiet.
Investigators have not come to uniform conclusions concerning the sense of smell and of taste. In all likelihood, smell is not acute at the time of birth. Taste probably is better perceived, yet some newborn babies are said to suck a two per cent solution of quinin as eagerly as milk, though stronger solutions are distasteful. According to the best available information a young infant can detect the difference between a sweet, bitter, sour, or salty taste only when the tests are made with a solution possessing the quality in question to a marked degree. It is common knowledge that babies cheerfully suck the most tasteless objects, and it is not improbable that at first the reaction depends upon the temperature of the object and the feeling it creates in the mouth.
The moment it is born, a baby perceives pressure if its skin is touched. To this sensation, however, some parts of the body are much more sensitive than others; the tongue and lips are most sensitive of all. Heat and cold are probably perceived more acutely by infants than by adults; to pain, on the other hand, babies are less sensitive. An infant is aware of the movements of its own muscles, and also appreciates a change from one position to another, as experienced nurses know very well, and on that account carefully avoid keeping a baby on one side continuously.
The vast majority of movements performed by young infants are reflex acts, that is, the cerebrum, the part of the brain with which thinking is done, is not concerned with their performance. Of these reflexes the most notable are sucking and swallowing, but sneezing, coughing, choking, and hiccoughing may also be observed; stretching and yawning have been recorded in several instances, even during the first days of infant life. None of these movements, we must remember, are produced consciously; the baby cannot reason and does not recognize anyone, even its mother.
HEREDITY.—The transmission of bodily resemblance and of traits of character from parent to child is a broad and complicated subject, whose fundamental principles biologists are just beginning to grasp. The facts thus far established regarding heredity relate chiefly to plants and to the lower animals. There is no doubt whatever that the meager knowledge we possess of heredity in man will be amplified and will ultimately indicate on the one hand the marriages which are advisable and, on the other hand, those which are not. Indeed, the foundations for a science called Eugenics, which purposes to improve the human race in this way, have already been laid. It is barely a decade, however, since our knowledge of heredity has approached that order and system which entitle it to be ranked as a science; and in this brief period great strides could hardly be expected in its most intricate field, that of human inheritance.
The modern teachings of heredity are of interest to us, nevertheless, since they intimate the time when a child's inheritance is fixed and the means by which hereditary characters are conveyed. To understand these fundamental points we must recall that at the moment of conception a male germinal cell combines with a female cell, and that this act, which is named fertilization, brings together vital elements from the two parents. We have seen that the spermatozoon represents the solitary contribution of the father toward the development of the child, and the spermatozoon, therefore, must convey the material basis of paternal inheritance. Similarly we might expect the ovum to be the bearer of the maternal qualities inherited by the child. This is actually true; but much of the evidence is of a technical character and must be omitted. Yet an experiment successfully conducted by Castle and Phillips will indicate, even to those who have no special knowledge of the mechanism of heredity, the important role the ovum plays. These investigators removed the ovaries from an albino guinea-pig, and in their place substituted the ovaries of a black guinea-pig. "From numerous experiments it may be emphatically stated that normal albinos mated together produce only albinos." But in this experiment the result was otherwise, for the albino into which the ovaries of a black guinea-pig were grafted produced only black offspring. The color-coat of her young, therefore, was not influenced by her own white hair, but was determined by the eggs really belonging to the black animal from which the ovaries were taken; in no other way can the result be interpreted. It is certain, moreover, that the mode of transmission of material qualities here exemplified is not exceptional; on the contrary there is no doubt that the ovum always conveys the sum total of the qualities the offspring inherits from the mother.
The germinal cells then contain the material basis of inheritance, and in all probability the substance is located within the nucleus of the cells. This substance had been seen and studied long before its relation to the problem of heredity was suspected. Because it takes a deeper stain than the rest of the nucleus, it stands out prominently when the cell is treated with certain dyes, and this property accounts for its name—chromatin. Under such conditions as prevail just before a cell divides, the chromatic substance is broken up and reassembled in the form of rods called chromosomes. Curiously enough the number of rods is uniform for each species of animal, though different numbers are characteristic of different species; the characteristic number for man is twenty-four.
Unless some arrangement was made to prevent it, the act of fertilization would cause the number of chromosomes in the fertilized ovum to be double the number characteristic of the species. In man, for example, the addition of twenty-four chromosomes from the spermatozoon to an ovum that already contained twenty-four chromosomes of its own would mean that after fertilization the ovum contained forty-eight. Such a result is prevented through the process to which we have referred in the preceding chapter as the ripening of the ovum, and also through a similar process in the case of the spermatozoon. These two processes lead to a reduction in the number of chromosomes, so that finally every human germinal cell contains twelve, and therefore when the ovum is fertilized the characteristic number twenty-four is restored. While we know nothing of the forces which determine, on the one hand, what elements shall be discarded by the germinal cells and, on the other hand, what elements shall remain, it is definitely proved that a selective process always takes place. This fact admirably explains the variation in the characteristics inherited by children of the same family. So far as is known, the traits which will be passed on from either parent are a matter of chance. Whatever these hereditary traits happen to be, the best evidence we have indicates that the problem of a child's inheritance is settled once for all the moment conception takes place.
MATERNAL IMPRESSIONS.—Contrary to all that we know of heredity, the conviction prevails among the laity that the character of a child depends greatly upon the mother's surroundings during pregnancy: this is the doctrine of maternal impressions. As is usual with superstitions, this one emphasizes the unfavorable possibilities and holds that the unborn child may be affected by the mother's unhappy thoughts or maimed by her mental distress if she is exposed to unpleasant sights. For this belief there is no foundation; the cases often cited in its support may be fully explained on the grounds of coincidence.
With the possible exception of such individuals as are spending their lives in solitary confinement, there is scarcely a human being who has not in the course of nine consecutive months some untoward physical or mental experience which engraves itself upon the memory. Prospective mothers are not apt to be exempt from a rule so general in its application, but if by good chance one happens so to be she will hardly fail to hear of the misfortune of others, which, according to the doctrine of maternal impressions, may be equally effective in interfering with the proper development of the child. We should then rightly expect most, if not all, babies to be "marked"— clearly a situation which does not prevail.
In order to learn how frequently prospective mothers may have disagreeable experiences which they fear will affect the formation of the child, I have lately asked the patients whom I have attended, "Was there any incident during your pregnancy to which you could have attributed the infant's condition, had it been marked?" The babies of all those to whom the question was submitted were normal; yet without exception those whose pregnancies just completed were their first answered in the affirmative. It is also pertinent that one of these patients had lost her brother by a violent and accidental death when she was four months pregnant; a similar bereavement was suffered by another at the eighth month; each was, however, delivered of a perfectly healthy child. Among those with whom the recently ended pregnancy was not the first I found some who could remember incidents popularly believed to have an influence over the development of the embryo; most of them, however, had given the matter so little thought that they could not definitely recall whether such incidents had occurred or not. From a similar series of observations covering two thousand cases, William Hunter came to the conclusion, nearly two hundred years ago, that there was no support for the belief in maternal impressions.
Whenever a child does happen to develop abnormally, it must be clear that, from the very nature of our existence, some incident can be recalled which will satisfactorily, yet unjustly, bear the blame. It may be confidently said, however, that, for every mother whose fears are realized, hundreds are agreeably disappointed in finding their babies perfectly normal. In the face of so many negative instances it is amazing that any person, even though ignorant of medical teaching, should be inclined to attribute abnormal development to something the mother has seen or heard, thought or dreamt, or otherwise experienced while she was pregnant. Yet unfortunately many do believe this. It is worth while, therefore, to supply further evidence, and thus escape any suspicion of unfairness in argument, to prove that maternal impressions are unable to affect the formation of the embryo.
It is found, as a matter of experience, that the superstition regarding maternal impressions generally begins to cause anxiety during the second half of pregnancy; and then such an influence is entirely out of the question. By the end of the second month the form of the embryo has been definitely determined, and subsequently cannot be altered. It is even true that errors in development are most apt to occur within the two or three weeks that immediately follow conception, and therefore occur at a time when pregnancy is not often clearly recognized. Thus it happens that women begin to worry about the influence their minds will have upon the formation of the child long after its form has been established.
Incidents in the life of a prospective mother are in point of fact equally inert so far as their influence upon development is concerned, no matter whether they occur during the earlier or later part of pregnancy. There is never any anatomical means by which maternal impressions could be conveyed to the embryo. Such an influence would have to be exerted through the placenta; and that is impossible. There are no nerves in the placenta to carry impulses from the mother to the child. Even the blood streams of the two beings are kept apart; and though it is unheard of that the blood should carry nerve impulses, if that happened to be the case, it could not prove effective here, for the blood of the mother does not enter the child. It is nourished by food which passes from the mother's blood, to be sure, but there is no more reason to expect this nutriment to exert an hereditary influence than there is to expect an infant to grow to resemble the cow with the milk of which it is fed. With these two possibilities eliminated, no path can be imagined by which impulses might travel from the mother to the embryo.
Scientific investigation has brought to light these facts, as it has also taught the real causation of the disfigurement once attributed to the mother's mind. Departures from the usual form of the body occur during the earliest days of pregnancy and arise in consequence of some irregularity in the process which molds the body-form from a simple spherical mass of cells. Why irregularities sometimes occur is not altogether clear; except in so far as it has been determined that the fault lies within the embryo itself. Whenever these defects are associated with events which have disturbed the mother's mind, it cannot be other than a simple coincidence.
CHAPTER IV
THE FOOD REQUIREMENTS DURING PREGNANCY
The Food-stuffs: Water; Mineral Material; Protein; Carbohydrate; Fat—
What We Do to Our Food—How Much Food Is Needed During Pregnancy?—
The Importance of Liquid Nourishment—The Choice of Food—Cravings—
The Relation Between the Mother's Diet and the Size of the Child.
There is a gain in weight during pregnancy amounting finally to about thirty pounds; exceptionally, it is as little as ten or fifteen pounds, and, at the other extreme, as much as forty or fifty. With individuals inclined to be stout the increase is greater, and it is relatively greater in later pregnancies than in the first. During the early months of pregnancy the weight generally remains stationary or suffers a slight loss; even in those rare instances in which the weight begins to increase shortly after conception the gain is less marked in the earlier months than later. For the last three months the average monthly gain has been found to be between three and a half and five and a half pounds.
The weight gained during pregnancy is not, as can be readily understood, permanently retained. At the time of birth, in consequence of the expulsion of the child, the after-birth, the amniotic fluid, and a varying amount of blood, there is necessarily a loss of from ten to fifteen pounds. Later, as the maternal tissues, whose growth has been stimulated during pregnancy, return to their original condition, a further loss in weight takes place. It is not unusual, however, for women to remain permanently better nourished than before they became pregnant. Under ordinary conditions the food of the prospective mother provides not only for her own wants but also for those of the embryo. Between the two organisms there exists a relation which resembles that existing between a house in course of construction and the contractor who supplies the building material. The mother furnishes what is needed to construct the "living edifice," as Huxley called the growing embryo, but she is not responsible for the lines of the building. The embryo is both architect and mechanic, designing the structure and arranging the "organic bricks" in their proper places. The work of construction necessitates the expenditure of an appreciable amount of energy and the creation of waste products that must be removed, lest they accumulate and interfere with the growing structure. These waste products leave the embryo by way of the umbilical cord and the placenta and return thus into the mother's circulation; ultimately they leave the mother through the same channels that carry off her own waste. First and last, then, the nutrition of the mother and of the child are so bound together that it has been impossible to study them separately. Our knowledge of food requirements during pregnancy has been obtained by measuring the food requirements of the mother alone; and as nutrition during gestation is fundamentally the same as nutrition at other times, it is necessary for us first to consider in general the food needed by the human body.
THE FOOD-STUFFS.—The waste products we throw off indicate that the substances which compose our bodies are being constantly broken down and reduced to a condition such that they are useless to us. In normal persons hunger signifies that they need material to replace what has been used up. The substances thus required, if the wants of the body are to be satisfied correctly, are called the food-stuffs; and they are the same during pregnancy as at other times. The foodstuffs are usually classified according to their chemical properties; on this basis they are placed in five groups: (1) Water, (2) Mineral Materials, (3) Proteins, (4) Carbohydrates, (5) Fats.
In view of the different purposes which the foodstuffs serve, it is convenient to group them in another way. Thus, the carbohydrates and the fats may be placed together because they are the body fuel; their value consists in the heat and energy which they yield when acted upon in the tissues. Water and mineral matter, on the other hand, are never a source of energy; they assist in building new tissue or in repairing tissue that already exists. The proteins are unique, in that they may serve either purpose. Primarily the proteins are tissue-builders, but in the absence of sufficient fat or carbohydrate the body burns protein to secure heat and energy.
Each food-stuff, therefore, serves a distinct purpose, and some of them render services which the others cannot perform. A man will die if either water or mineral matter or protein is completely withdrawn from his diet. Fat or carbohydrate, on the other hand, or even both of them, may be excluded for some time without causing serious inconvenience. It is true, nevertheless, that each food-stuff performs some task better than any of the others can perform it, and for that reason all of them should be included in the diet of an healthy individual.
Some of the food-stuffs, such as water and table salt, come to the body separate from the others; but generally the different types reach us intimately mingled in the various articles of food in common use. Foods vary greatly, however, in the amount of the different food-stuffs they contain. The meats, for example, have a relatively large protein content; in the vegetables starch, which is one of the carbohydrates, predominates. As to the choice of food and the amount that is necessary for the average person, generally the appetite is a safe guide; but the accurate observations of physiologists have gone so far as to determine the exact requirements of the body. Not the least important principle taught by these investigations is to avoid dietary fads, for in arranging a satisfactory diet the problem to be solved is not, What is it possible to live on? but, What serves best as nourishment? The experience of countless generations has taught us that we thrive best on a diet which includes all five food-stuffs.
Water constitutes nearly two-thirds of the weight of the body. As water is constantly being given up in the life process, health demands an abundant supply of liquids to replace the waste. The average daily loss has been found to be between two and three quarts. Of this amount the urine constitutes nearly two-thirds; and the remaining third is eliminated through the skin, the lungs, and the bowels. Although the deficiency thus created is met in part by the water in our solid food, the greater part of the loss is made up by the liquids we drink, and we are warned, in a measure, by the sensation of thirst that they are needed.
Mineral material is of the greatest importance as a constituent of our food. It contributes to the welfare of the body in at least three ways; (1) it gives rigidity to the bones, (2) it supplies an essential ingredient of the living substance in all the tissues, (3) it is present in the blood and in the other body fluids, where it is of service in such vital processes as the beating of the heart, the transportation of oxygen to every portion of the body, and the maintenance of an acid or alkaline condition of the digestive juices according as the one or the other is necessary for the assimilation of the food.
An animal deprived of mineral food will die as surely as one deprived of water. In arranging our diets, however, we are not compelled to take the minerals into account, for, with the exception of table salt (sodium chlorid), the meat and vegetables that we eat provide the mineral material the body requires. Iron, for example, which imparts to the blood one of its most essential qualities, occurs in relatively large amounts in apples, spinach, lettuce, potatoes, peas, carrots, and meats. Only now and then does it become advisable to add iron deliberately to the diet. Similarly lime (calcium) the material that makes the bones hard, is present in quantities ample for the needs of the body in the bread, milk, eggs and vegetables that we eat. The remaining mineral constituents of the body, among which the most conspicuous are magnesium, potassium, sulphur, and phosphorus, occur in foods which we are naturally inclined to take, so that we secure an abundance of them unconsciously.
Protein, the third food-stuff which we must eat to keep alive, contains the chemical element nitrogen in such form that it can be incorporated in our tissues. Although most persons derive their protein in part from meat, milk, and eggs, it is possible to satisfy the requirements of the body on a purely vegetarian diet. Experience has shown, however, that it is both natural and advantageous that we employ a mixed diet.
The property of protein to build living tissue and replace tissue waste probably depends upon several factors; but certainly one of them is the presence of nitrogen. So intimately associated are the consumption of the tissue substance and the elimination of nitrogen that we have no better way of judging the amount of tissue substance used in the body than by determining the quantity of nitrogen that appears in its various waste products. From such investigations it has been found that the quantity of protein required to repair the breaking down of the tissues is not great. The average man consumes approximately a quarter of a pound (100 to 120 grams) of protein daily; but this quantity is in excess of his real needs. Indeed, Chittenden has shown that for various classes of individuals, namely, students, athletes and soldiers, half as much is sufficient. Other physiologists, though admitting that this is true, contend that it is inadvisable to regulate one's diet on such a slender basis. Very good reasons are assigned for the view that more protein is needed than just enough to counterbalance the tissue waste. Thus, in the case of animals, it has been found that a diet low in protein finally causes digestive disturbances and other ailments.
Although it does not seem advisable to practise rigid economy in arranging the protein content of the diet, it is equally important that we should not go to the other extreme. The consumption of over- large quantities of protein, as would be the case if we lived exclusively upon meat, increases putrefaction in the intestines and throws unnecessary work upon the kidneys, which are the organs chiefly concerned in getting rid of the waste products of protein.
Carbohydrate is the name given the group of foodstuffs to which the sugars belong. The food value of cane sugar, the most familiar member of the group, was recognized even in prehistoric days by the natives of India. By boiling the plant we call sugar-cane they obtained a substance to which they gave the name Sakkara, and from this our word sugar evidently originated. The roots of this plant were carried into Europe and cultivated during the Middle Ages. Obviously, its value was and is appreciated, since the cultivation of the sugar-cane and the sugar-beet has become the foundation of a great modern industry.
There are some persons, perhaps, who do not realize that beside cane sugar many kinds of carbohydrate occur in our food. Glucose or grape sugar, for example, occurs not only in the fruit indicated by its name, but also in other fruits, in corn, in onions, and in the common vegetables. Glucose is especially suited to act as nourishing food. In keeping with that fact our digestive juices convert most of the sugars we eat, if not all of them, into glucose, which is regularly present in our blood. It is unnecessary to enumerate all or even the more important compounds included in the carbohydrate group; but everyone should know that starch is its chief member, and that after being thoroughly digested starch enters the body as glucose and therefore serves the same purpose as sugar.
The value of carbohydrates as a source of heat and energy may be accurately measured, and is technically expressed in terms of a unit, called the calorie. As the energy which our bodies require may be estimated in the same terms, it is possible to determine whether or not our food is equal to our wants. Very naturally the energy requirements of any individual are influenced by his weight and by the work he does. But we may take as a standard the results of an extensive study of American families which indicate that women require four-fifths as much energy-yielding food as men. It also seems safe to conclude that a woman weighing 130 pounds who does her own housework requires food every day having an energy-value of 2,500 calories; smaller women and those who do no work require somewhat less. In a mixed diet the chief source of this energy—and the source from which it is most economically obtained—is the carbohydrates.
Fat yields more energy and heat than does carbohydrate, bulk for bulk; but fat is burned by our tissues less readily. We instinctively avoid eating a great deal of this food-stuff; in the course of a day the average person consumes no more than one or two ounces. The natural aversion which many feel toward fat may possibly depend upon the difficulty with which they assimilate it. In colder climates, however, we know fat to be a staple article of diet; and it is not unlikely that the very conditions which make it necessary there explain the unusual tolerance for it.
Fat is more than fuel. Deposited in our bodies, beneath the skin for example, it prevents the escape of heat that we generate and protects us against the penetration of cold. This food-stuff, therefore, contributes in several ways toward maintaining the temperature of the body at a constant level.
Our source of fat is chiefly animal food and in a smaller measure vegetables; but the fat our food contains is not altogether responsible for the fat in our bodies. Carbohydrates, if in excess of momentary needs, are partly converted into fat and stored as such. A reserve supply of nourishment is thus provided, and is drawn upon only when the food that we consume does not contain as much energy as we expend.
WHAT WE DO TO OUR FOOD.—With the exception of water and mineral substances, the food-stuffs must undergo chemical alterations before they are capable of being absorbed into the body; this is the work of digestion. The digestive processes, the main purpose of which is to break up the carbohydrates, proteins, and fats into substances of much simpler chemical structure, begin in the mouth and are not completed until some time after the food has entered the intestine. As the food moves through the alimentary canal, it is mixed with the various digestive juices containing ferments, such as pepsin, which are the active agents of digestion. Although digestive processes go on automatically, they are, in a degree that is far from negligible, influenced by the mind. Thus, cheerfulness promotes digestion, and not infrequently mental depression may be the direct cause of indigestion. Indeed, it is chiefly in regard to the state of the mind of the prospective mother that the existence of pregnancy may be said to have a bearing, whether favorable or unfavorable, upon her digestion.
The digestive juices are prepared in glands which lie either within the lining of the alimentary canal or adjacent to it. In the latter event the glands are connected with the canal by means of tubes. These glands must be warned when to pour out their secretion, and their very first warning usually comes from the agreeable sensations experienced when we see, smell, or taste inviting food. If we are hungry, our viands attractive, and our surroundings congenial, the stimulus excites a plentiful secretion of the digestive juices; conversely, the opposite conditions, to some extent, check their flow.
The sight of attractive food, as we all know, "makes the mouth water," that is, it calls forth the saliva which contains one of the digestive ferments. Thus, at the beginning of a meal, favorable conditions for digestion are established. The saliva, however, acts only upon starch; and, moreover, its action upon this carbohydrate is weak unless the food is thoroughly chewed and mixed in the mouth. Most of us, perhaps, overlook the importance of mastication, which not only crushes all the food-stuffs, preparing them for efficient digestion, but also stimulates the flow of the digestive juices. Furthermore, by thoroughly masticating our food, we know intuitively when we have had enough, and thus avoid overeating.
In the stomach the digestion of starch is continued for a time, but the chief work of gastric digestion concerns the proteins. They alone are attacked by pepsin, a ferment secreted by the mucous membrane of the stomach. Moreover, since pepsin is able to act only when an acid is present, the gastric mucous membrane also secretes hydrochloric acid.
Just as the digestive glands in the neighborhood of the mouth become more active when we are conscious that desirable food is at hand, so do the glands in the stomach. Mastication also stimulates the flow of the gastric juice, and this flow is greater if we enjoy what we eat. Furthermore, it has been shown that, after entrance into the stomach, the food itself increases the flow of the digestive juices. All articles of food are not, however, equally efficient in producing this effect: thus meat requires more pepsin for satisfactory digestion than bread, and consequently meat calls forth a larger quantity of gastric juice.
Fat in all probability is not digested in the stomach; even starch and protein are not broken down sufficiently by the time gastric digestion is complete to permit them to be absorbed into the body. "The value of digestion in the stomach," as Howell says, "is not so much in its own action as in its combined action with that which takes place in the intestine." It is even possible for satisfactory digestion to take place without the assistance of the stomach. This fact has been substantiated by several cases in which men have lived for years after the stomach was removed to eradicate a disease. It is true, nevertheless, that intestinal digestion can be performed more economically if it begins where gastric digestion normally leaves off.
Of the changes wrought in the food by the various digestive processes, those which are the most profound take place in the intestine. While the food is being moved through this organ—some thirty feet in length—it is reduced to simple chemical fragments, which are absorbed by the intestinal wall. Digestion in the intestine is carried on through the agency of a number of ferments, the more important of which are supplied in the juice manufactured by the pancreas. The pancreatic secretion contains three separate and distinct ferments, which act respectively upon carbohydrate, protein, and fat. The absorption of fat, however, is materially assisted also by the action of the bile.
A part of what we eat always escapes digestion; the unused portion, it has been estimated, is somewhat less than one-tenth of an ordinary mixed diet. The residue from vegetables is notably larger than the residue from meat. The undigested portions of all the food- stuffs collect in the lowermost portion of the intestine and form a part of the feces. Here also are gathered the indigestible material we have eaten, the products of bacterial decomposition in the intestine, and other waste substances that the body should throw off.
HOW MUCH FOOD IS NEEDED DURING PREGNANCY?—In connection with the development of the child we have already referred to the difference in the purpose of the constructive processes which go on in the earlier months of gestation and those which take place in the later months. In a general way the first half of pregnancy is occupied with the formation of the embryo from relatively simple structural elements, the second half with its growth into an infant, which acquires ninety per cent. of its substance and weight at birth after the fifth month of embryonic development. A similar contrast may be observed in the nutritional processes of the mother. Often, at the beginning of pregnancy, the appetite is poor and there is indisposition of one kind or another, with the natural result that there is slight if any change in the mother's weight; whereas later a period ensues when her appetite increases, her health improves, and she gains in weight.
Since it is natural that the weight of the mother should remain practically stationary during the early months of pregnancy, it is clear that a diet which has previously been ample will likewise be sufficient for some time after conception has taken place. To most persons, however, it is not clear that the quantity of food ordinarily eaten will suffice also during the later months of pregnancy. On the contrary, popular opinion holds that the prospective mother "should eat for two." It is not unimportant to point out the erroneous character of this superstition, because overeating during pregnancy is much more likely to provoke discomfort than insufficient nourishment.
In order to comprehend the nutritional needs of the prospective mother, one must keep in mind the fact that our food always serves two purposes. These are, as we have seen, to build or to repair tissue and to furnish heat and energy. Since these needs of the body during pregnancy—as at all other times—are best understood when considered in their relation to the food-stuffs which supply them, we shall take up these various ingredients separately.
Protein, which repairs tissue and also furnishes the substance from which new tissue is made, is used more economically during pregnancy than when the maternal functions are inactive. As a result of this economy the same allowance of protein which is sufficient before conception is sufficient also during pregnancy. This fact has been put in the clearest light by extensive observations made upon animals. Dogs which were not pregnant, for example, have been carefully fed so that their food should contain just enough protein to cover the needs of the body and keep their weight constant. Subsequently, when these animals became pregnant precisely the same amount of protein was fed to them. The result was that they gained in weight, and at the same time the waste products of protein they threw off were notably diminished. Such observations, of which there have been a large number yielding concordant results, may be safely taken to mean that an amount of protein previously satisfactory for the animal is also sufficient for her during pregnancy. We are forced to conclude that protein was used more sparingly in the latter condition—a view which has been repeatedly confirmed with regard to human beings as well as animals. It is found, for example, that an amount of protein competent to meet the needs of a man of a given weight will not only provide for the wants of a woman of equal weight while she is pregnant, but will also leave a surplus sufficient for the growth of the fetus.
With regard to the mineral substances, likewise investigations indicate that the "housekeeping" of the body during pregnancy proceeds along unusually economic lines. It is not advisable, therefore, to make any change in the diet with regard to these substances. Attempts have been made to cut down the amount of minerals in the food for the purpose of softening the fetal skeleton. The success sometimes attributed to these efforts is, however, very doubtful, for we know that the mother's tissues will be robbed of minerals for the embryo whenever her food fails to contain them in sufficient amount for her own needs and those of the child. Practically speaking, the mineral content of diet during pregnancy requires no thought, for so long as meat and vegetables are eaten in satisfactory quantity the mineral nutrition will take care of itself.
The food-stuffs which supply heat and energy, since the amount of energy utilized by the body during the latter months of pregnancy is somewhat in excess of that previously required, do not follow the same rule as the protein and the mineral matter. It has been found that just before the fetus becomes mature the energy requirements of the mother are approximately one-fifth greater than in the non- pregnant condition. It is certain, however, that no extra demand for energy exists until the fifth or sixth month of pregnancy, and that the excessive requirement is extremely small until the last three or four weeks. Even then the prospective mother requires less energy- giving food than the average man.
Since the body handles carbohydrate more readily than fat, it is preferable that whatever additional energy pregnancy necessitates should be supplied by carbohydrates. An increase in the daily consumption of fatty food, over and above that previously found agreeable, is not only unnecessary but undesirable. Every-day experience teaches that less fat taken with the meals promotes the comfort of the prospective mother. A glass of rich milk a little before meal time, however, not only makes up for this omission but also prevents "heart-burn," a very common ailment of pregnancy.
Although there is an appreciable increase in the quantity of starch and sugar utilized toward the end of pregnancy, it is generally quite unnecessary to increase these materials correspondingly in the diet. Nearly everyone eats more of all the food-stuffs than the body needs. In the case of the prospective mother the surplus ordinarily taken meets every need incident to her additional energy requirements. Because we eat more than we need, someone has said, with as much truth as humor, that prospective mothers "neither want nor need to eat for two. The fact is more likely that enough for one is too much for two." For the average woman it is wiser to take less during pregnancy rather than more, for over-indulgence is apt to lead to indigestion. The moment when the appetite is satisfied should be accepted as the stopping point, and that will be instinctively recognized if one eats deliberately, and thoroughly masticates the food.
Regularity in the hour of eating is always healthful, and for some prospective mothers three meals a day prove quite satisfactory. Not a few, however, who adhere to this habit make the mistake of eating more than is wise; and large meals are particularly inappropriate to pregnancy. On this account most prospective mothers will be more comfortable if they take some simple and wholesome nourishment at fixed times between meals. Such an arrangement modifies a ravenous appetite, and it is, at the same time, beneficial to those who are not inclined to eat enough at the regular meals. If small amounts of food are taken five or six times a day, a tendency to be nauseated, which is not uncommon in the early months of pregnancy, can often be averted. In the latter months, too, because the capacity of the stomach is diminished through the encroachment of the enlarged womb, frequent meals generally contribute toward comfort and health. While the inevitable consequences of overloading the stomach are to be avoided at all times of the day, it is especially important to remember the disagreeable results of a hearty meal at night. The evening meal should be a light one and should be eaten three or four hours before going to bed.
THE IMPORTANCE OF LIQUID NOURISHMENT.—Every prospective mother should have brought to her attention the great importance of drinking water at regular times and in larger quantities than was formerly her custom. Since water constitutes two-thirds of the substance of our bodies, it is necessary, of course, for everyone; but during pregnancy it is especially necessary for the building of new tissue and for safeguarding the mother's kidneys. Prospective mothers would protect themselves against a number of ailments if they were more careful to drink a sufficient amount of liquids. They may easily determine whether they are doing so, for whenever the urine passed during twenty-four hours measures less than a quart, they are not drinking enough. Generally the daily elimination of urine fluctuates between two and three pints; a larger amount, however, is rather a favorable indication than the reverse.
The variations in the quantity of liquids that healthy persons drink make it impossible to say just how much anyone should take. It may be said with confidence, however, that women who are pregnant should consume at least three quarts of fluid every day, and by far the greater portion of this should be water. The rest may be taken in the form of milk, soup, cocoa, and chocolate. Against the moderate use of tea and coffee no valid objection can be raised; the tradition that they may cause miscarriage is incorrect. For well-known reasons the habitual use of strong tea or coffee is always harmful, and it is, therefore, equally as objectionable during pregnancy as at other times. Beverages which contain a small percentage of alcohol, such as malt and beer, may or may not be helpful; they should be regarded as medicine, not to be taken without consulting a physician.
THE CHOICE OF FOOD.—There is no diet specifically adapted to the state of pregnancy; the prospective mother may usually exercise the same freedom as anyone else in the selection of food. She should, however, choose what will agree with her and avoid that which she cannot digest and assimilate. Personal experience in the main must guide everyone as to what to eat, and most women may follow the dictates of appetite after they become pregnant as safely as they did before.
It is true, of course, that careful scientific observations have taught not only what the nutritional requirements of the body are, but also how the diet may be arranged to satisfy these requirements most conscientiously and economically. "Caloric Feeding" is the name given the method which aims to furnish an individual the exact amount of food, and usually to furnish it at a minimum cost. Its principles are of great practical importance to the commissary of an army or to the purveyor of an institution which provides for large numbers of people; but it is neither necessary nor advisable that the diet of any healthy individual be regulated solely with a view to satisfying the actual requirements of his or her body. Food should possess other qualities than fuel value: first of all it must be appetizing, for appetizing food receives the most thorough digestion.
We all know how variable are our appetites. What appeals to one will not appeal to another, and frequently the same person has no appetite to-day for food that she will eat with relish to-morrow. Precise rules, therefore, to guide healthy persons in the selection of their food are not obtainable; neither are they desirable, for the exercise of individual preference possesses notable advantages. In order, however, that there may not also be disadvantages, the prospective mother, like anyone else, must be content to choose food that is simple, wholesome, and of such a character that it will not throw an undue burden upon the digestive organs.
During pregnancy some uncooked food should be eaten every day. Ripe fruit answers the purpose admirably. At all seasons of the year fruit of one variety or another, such as apples, peaches, apricots, pears, oranges, figs, cherries, pineapples, grapes, plums, strawberries, raspberries, and blackberries may be obtained and should have a place in the diet. In making a choice personal taste alone need be consulted.
Fruit contains a large proportion of water as compared with other articles of diet; and, therefore, is especially capable of quenching thirst. Fruit also lessens the desire for sweets, acts as a laxative, and furnishes mineral material which the body needs. Its laxative effect is most pronounced when it is eaten alone, as, for example, in the morning before breakfast or at night upon going to bed; cooked fruit taken with the meals acts much less effectively. Fruit and vegetable salads are wholesome, but cannot be recommended indiscriminately during pregnancy, for not infrequently the dressing used with them causes discomfort. Under these circumstances it is obvious that one should do without salads.
The cereals wheat, corn, rye, oats, and barley are the most prominent source of starch in an ordinary diet. Breakfast foods manufactured from grain are not only nutritious in themselves, but their value is increased by the milk or cream used with them. Bread is the staple starch-containing food in this country, and starch is our main source of energy, but it is necessary to eat only a small quantity of bread, if the diet includes a relatively large amount of vegetables. It is advantageous to use bread made from unbolted flour (Graham bread) or from corn meal, because the coarse undigested residue which they leave stimulates the movements of the intestine and assists in overcoming the constipation which is generally associated with pregnancy. Pastry must be avoided by those who suffer from indigestion; and every prospective mother should eat pastry only occasionally, and not very much of it at any time. The best desserts are raw and freshly cooked fruit, preserves, gelatin, custard, ice cream, and light puddings, such as rice and tapioca.
Vegetables should be abundant in the diet of every prospective mother. Some of them, however, are digested with difficulty, and on this account cabbage, cauliflower, corn, egg-plant, cucumbers, and radishes should be eaten sparingly. Occasionally it will be necessary to exclude them from the diet altogether. Other vegetables produce flatulence, and for that reason parsnips and beans may cause discomfort. The prejudice, however, which exists against onions, asparagus, and celery should not be heeded; all of them are harmless, and celery thoroughly cooked with milk is very wholesome. Besides these, moreover, there are many highly nutritious and easily digestible vegetables which can be freely recommended, such as both sweet and white potatoes, rice, peas, lima beans, tomatoes, beets, carrots, string beans, spinach, Brussels sprouts, and lettuce.
Vegetable food contains all the material necessary to sustain life, and some persons prefer to adhere strictly to a vegetarian diet. Most prospective mothers, however, find a mixed diet more agreeable, and this is sufficient reason for using it. Furthermore, no fair objection can be raised against the use of animal food, provided the pregnancy is normal. It is important, nevertheless, to remember that meat contains protein in concentrated amounts, and that meat once a day answers every need not only of the mother but also of the growing fetus.
The ideal animal foods are milk and eggs; they contain every ingredient necessary to repair old and to form new tissues. But usually the prospective mother may have any animal food she wishes: beef, veal, lamb, poultry, game, fish, oysters, and clams. The relatively large fat-content of pork, goose, and duck renders them indigestible for some persons, who, of course, should not eat them.
From what we have learned about foods in general and their relation to pregnancy it is clear that the question so often asked by prospective mothers, "Are there any special directions regarding my diet?" may be briefly answered as follows: Under no circumstances is the need of food increased in the first half of pregnancy. During the last two or three months, while the most notable growth of the fetus is in progress, there is a perceptible increase in the amount of energy expended by the mother, and this may be readily supplied by a glass of milk or some equally simple nourishment between meals. Furthermore, throughout pregnancy, most women are made most comfortable by frequent small meals; they will almost certainly suffer discomfort if heavy meals are eaten three times a day.
The most nearly ideal diet consists of very little meat and a comparatively rich allowance of vegetables and fruit. The food should be chosen with regard to individual appetite and should be varied frequently. Thorough mastication always increases the efficiency of a diet. Thus the food will be most perfectly mixed with saliva and broken into fragments which can be readily attacked by the digestive juices of the stomach and the intestines.
CRAVINGS.—There is a well-known tradition that women who are pregnant are subject to longings for one article of diet or another, and that unless the desire be promptly gratified the child will be "marked." In the light of what has already been said regarding maternal impressions, this evidently is nonsense. A prospective mother, like anyone else, does frequently desire one article of food more than another. So long as the object of her wish is not obviously harmful, it should be granted; but if it is not granted no harm will come to the child.
Remarkable instances in which disgusting substances have been craved and eaten are often talked about and have even found their way into popular novels. The unfortunate victims of these unnatural cravings are not of sound mind. With reference to them a physician of unusually broad experience wrote fifty years ago, "I have never met with any example of this sort; which leads me to infer that these longings are more frequent in books than in the practice of our art." This conclusion is even more fully justified to-day than when originally expressed.
THE RELATION BETWEEN THE MOTHER'S DIET AND THE SIZE OF THE CHILD.— With the beginning of careful, scientific study of the nutritional problems of pregnancy, investigators were interested to learn the source of the material which was used to build up the child's body. Two possibilities suggested themselves: one that the material came from the mother's food and the other that it was derived from her own flesh. In order to determine which of these methods was the natural one, animal experimentation was resorted to and gave identical results in the hands of independent observers. It was found, as I have already stated, that the same diet which had previously kept an animal's weight constant was sufficient to meet her requirements during pregnancy and also to provide for the growth of her offspring. The mother animal was actually found somewhat heavier at the termination of pregnancy than at the beginning. It seemed fair to conclude, therefore, that nutrition had proceeded along more economic lines, and that under these conditions the customary diet had furnished the material for the formation of the young. Still other observations indicated that, if the food is not sufficient for both mother and offspring, it is Nature's plan to protect the young and leave the mother's wants incompletely satisfied. On the other hand, when an unnecessarily large amount of nourishment is taken, the excess is stored partly in the young, and partly in the mother's body.
There can be no doubt that the results of such observations upon animals are applicable to human beings. Everyone familiar with the practice of obstetrics knows that women who gratify enormous appetites during pregnancy, especially if they also fail to take exercise, give birth to large children. On the other hand, it is said that children born during times of famine are frequently delivered prematurely, or, if mature, they are small and puny. A similar though much less marked contrast exists between the babies of the working classes and the well-to-do, and clearly indicates that the weight of the baby varies directly with the food of the mother.
The quantity of the food is more influential than its quality, though the latter is also a factor in determining the size of the child. An excessive amount of starch or sugar in the mother's diet is stored as fat in the child. On this account it is reasonable to eat sparingly of candy, cake, and other sweets; but further attempts to reduce the weight of the fetus by discrimination against different articles of food are not advisable.
The various theories that have been advanced with a view to reducing the size of the child are impracticable; some of them, rigidly carried out, would actually jeopardize the health of both beings. All of them are designed to make the infant's bones soft and to diminish the fat in its body. To this end, generally about two months before the expected date of birth, the mother's diet is arranged to consist chiefly of meat; and as far as possible she is denied candy, sweet desserts, soup, bread, cereals, vegetables, and water. Such a diet overlooks, among other things, the tremendous importance of liquids to the woman who is pregnant. Certainly its indiscriminate use would result in far more harm than good; and no one should adopt it without minute directions from a physician.
Attempts to make the infant's bones soft by limiting the mother to food containing extremely small amounts of lime and other minerals are also unnatural, for we have learned that whenever the mother's food fails to contain the material the fetus requires the mother's tissues are called upon to supply it. Under these conditions, therefore, her bones will give up their lime.
It is of the very first importance that the mother's nourishment be correct from the standpoint of her own requirements, and such treatment will also redound most beneficially to the child. She should never fall, however, into the error of over-eating, which will not benefit her and will cause unnecessary growth of the fetus. On the other hand, there can be no justification for measures that tend to weaken her. She may be careful, in other words, to avoid over- growth of the fetus, but should not adopt a diet so restricted as to interfere with normal development. So long as her health is successfully maintained, she may give herself no concern as to what the size of the child is likely to be. That is a detail which concerns her physician, and which will be observed by him several weeks before the expected date of birth.
CHAPTER V
THE CARE OF THE BODY
The Bowels—The Kidneys—The Skin—Bathing—Douches—Clothing—
Corsets—The Breasts.
If we stop to think it is only too apparent that the human body is a machine. We seize energy in one form and convert it into another, just as truly as do the windmill, the locomotive, and the dynamo. In the case of the human machine, the latent energy of the food is turned into the various activities of everyday life. Our bodies utilize their fuel more perfectly than any machine that man has invented; but they fail, nevertheless, to do so completely. And just as the efficiency of an engine cannot be maintained unless the smoke escapes and the ashes are raked away, so no human being can enjoy health unless his waste products are promptly removed. The task of removal, as most of us know, is assumed by our excretory organs, which include the bowels, the kidneys, the skin, and the lungs.
During pregnancy the mother must get rid not only of her own waste products, but also of those of the child. The waste products of the child, if weighed, would not amount to a great deal; but they are by no means negligible. So far as we can tell, it is chiefly on account of their peculiar character that they increase the work of the mother's excretory organs. Whatever the cause, they do increase it, and experience has taught us that these organs must always be kept in a healthful condition to protect both the mother and the child from harm. Consequently a prospective mother who wishes to take proper care of her body must, in the first place, direct her attention toward keeping up the normal activity of all the excretory functions.
THE BOWELS.—While pregnant, nine out of ten women suffer from mild constipation. Those who have been previously troubled with this complaint may find it aggravated from the outset, but in most instances it does not appear until after several months have passed. Constipation is explained by the fact that the enlarged womb presses against the intestines; and, as the enlargement increases, constipation generally becomes more pronounced. No doubt there was a time when women, perhaps unconsciously, counteracted this natural result of pregnancy by the use of a diet consisting largely of fruit and vegetables and also by outdoor exercise. Such measures, indeed, still afford the simplest means of overcoming constipation.
Throughout pregnancy the bowels should move at least once every day. When they do not, some of the waste material that should be removed is absorbed by the body and seeks to leave it through the organs that are already doing their full share of work. For example, under such conditions, the kidneys, instead of exerting themselves more vigorously, may become less active than they were.
It is everyone's duty to form the habit of having the bowels move regularly. Now the most favorable opportunity for assisting the intestines to empty themselves occurs shortly after meal-time, since the involuntary movements of the intestines are most active while digestion is in progress. It should be regarded as an imperative duty, therefore, to grant Nature such an opportunity every morning just after breakfast. This should be done at a definite hour, day after day, even though the inclination is absent; and in many instances the desired habit will be formed.
A glass of water on going to bed or on getting up has a laxative effect; and there are other dietary measures which may be employed with advantage. Thus, coarseness of the food, as we know, stimulates intestinal activity, and this fact explains the peculiar value of Graham bread, bran bread, and corn bread. Fresh fruit and vegetables counteract constipation for two reasons, namely, because they leave in the bowels a relatively large amount of undigested substance, and because they contain ingredients that have a specific purgative action. Such ingredients are especially noteworthy in rhubarb, tomatoes, apples, peaches, pears, figs, prunes, and berries.
Enemas used as a routine measure are mischievous. They interfere with the "tone" of the bowel-muscle so that it acts sluggishly and bring about a condition in which the bowels will not move without artificial stimulation. At best these irrigations remove no more than the contents of the lower bowel, and should be employed only when there is acute and urgent need of clearing out the rectum.
Obstinate constipation is uncommon, and strong purgatives are seldom needed. If they become necessary, a physician should be consulted as to what to take. Whenever dietary measures and exercise, which is discussed in the next chapter, fail to counteract the natural tendency toward constipation, the prospective mother may generally resort to "senna prunes" or some equally simple and harmless household remedy. Senna prunes are prepared as follows: Place an ounce of dried senna leaves in a jar and pour a quart of boiling water on them. Allow to stand two or three hours; strain off the leaves and throw them away. To the liquor add a pound of prunes. Cover and place on the back of the stove, allowing to simmer until half the liquor has boiled away. Add a pint of water and sweeten to taste, preferably with brown sugar. The prunes should be eaten with the evening meal. The number required must be learned from experience. Begin with half a dozen, and increase or decrease the number, as required. The syrup is an even stronger laxative than the prunes.
THE KIDNEYS.—Any one may judge for herself whether or not the bowels are doing their work satisfactorily, but not so with the kidneys. For this purpose the urine must be examined by a physician. In spite of this fact, considerable responsibility rests upon the prospective mother, whose duty it is to collect the specimens properly—a detail that is apt to be neglected. It is impossible to urge too strongly the importance of saving, at regular intervals, all the urine passed in twenty-four hours, of protecting it from decomposition, and of sending a sample to the physician. The intervals may be longer at first, for the kidneys have very little extra work to do until the sixth month. Usually, therefore, it is a satisfactory plan to send a sample for analysis the first of each month during the early half of pregnancy; but during the latter half one should be sent the first and the fifteenth of each month.
To estimate the exact amount of urine passed in twenty-four hours and to protect it properly, in the first place, the vessel in which it will be collected should be carefully scalded out. As a further precaution against decomposition, add a teaspoonful of chloroform to the vessel, which should be kept covered, and not allowed to stand in a warm room. Unless these details are conscientiously observed, putrefaction may take place and vitiate the analysis the physician wishes to make. The precise amount of urine which the kidneys excrete in twenty-four hours will be determined as follows: At a convenient time, for example at 8 A.M., empty the bladder and throw the urine away; this marks the beginning of the observation. Subsequently, save all the urine passed during the day and night, and finally at 8 o'clock the next morning empty the bladder and add this urine to that previously collected. The total amount, thus collected, should be measured.
It is unnecessary to send all the urine to the physician; six ounces, somewhat less than half a pint, will be enough. But the physician should know what the total amount was found to be; therefore, a record of the measurement, the date, and the patient's name should accompany the sample. If limited to a single fact about the urine, it would be most helpful to know the amount passed during the twenty- four hours. In this way, as I have already pointed out, the patient herself may derive valuable information, for if the urine is scanty in amount—that is, less than a quart—she should drink more water.
Unscrupulous newspaper advertisements alarm people through incorrect statements about trouble with the kidneys. For example, they declare that a sediment in the urine is a sign of disease; but that is false. The mere act of cooling sometimes causes substances to crystallize out of perfectly normal urine. Or, putrefactive changes which frequently take place after the urine has stood for a time may cause some of its normal constituents to be precipitated. A sediment, either white, pink, or yellow, may indicate that the urine is too concentrated, and consequently means that the individual should drink water more freely; but it generally means nothing more serious. The really important abnormal constituents of the urine, namely, albumin and sugar, never form a sediment.
"Pain in the back" is a complaint frequently used to defraud the public. This symptom does not indicate Bright's disease. It is generally due to the muscles far away from the kidneys, with which, usually, the pain has nothing whatever to do. Similarly a desire to pass the urine frequently does not indicate any disturbance of kidney function, but is explained by the pressure of the enlarged womb against the bladder; it is a very annoying, yet a natural, result of pregnancy.
THE SKIN.—The functions of the skin are at the very foundation of health. It protects the delicate structures which it covers, assists in the regulation of the temperature of the body, and excretes waste products. The excretory function of the skin is always active, but we are unconscious of this activity except on warm days and at times when we perspire freely. In the coldest weather, however, the body throws off what physiologists call the "insensible perspiration." The most important measures for the care of the skin are those intended to insure the activity of the sweat glands, namely, bathing and proper clothing. But before considering these measures, we will describe certain alterations in the skin which cannot escape the notice of the prospective mother, and which she is likely to misinterpret.
On account of the growth of the uterus the abdominal wall is stretched during pregnancy. To a certain degree the skin yields to the distention, but it finally cracks, and lines appear which are commonly called "pregnancy streaks." At first they are delicate and pink or blue in color; later they become white and more extensive.
The streaks indicate the situation of small breaks in the deeper layer of the skin, which is less elastic than the upper layer. They are not painful, and should never cause anxiety. Their size and number vary with the degree of abdominal distention, which in turn depends upon various factors, such as the size of the child and the quantity of amniotic fluid. Although these streaks are most frequently located upon the lower part of the abdomen, they may extend to the outer sides of the thighs; and occasionally appear over the breasts, since they too enlarge during pregnancy. Stretching of the skin, of course, is not confined to pregnancy; consequently, the same kind of streaks often appear in people who are growing stout.
Attempts to prevent or limit the pregnancy streaks prove futile. There is a common belief that they may be prevented by the use of vaselin, goose-grease, mutton-fat, or some one of a variety of lotions; but this teaching is not borne out by experience. None of these applications, however, are harmful, and there can be no objection to using them except that they cause needless soiling of the clothing. After the child is born the streaks fade of their own accord, though they rarely disappear entirely.
In certain localities the skin grows darker during pregnancy. We have already referred to the deepening of the color around the nipple as one of the signs of pregnancy; a similar but much less pronounced discoloration occurs about the navel, which also becomes shallow and may begin to pout in the latter months of pregnancy. About this time, with very few exceptions, there appears a more or less intense brown line which runs downward from the navel in the middle of the abdomen. Sometimes, though not very often, small dark areas, which have been called "liver spots," appear elsewhere over the body. The name is unfortunate, for the spots do not indicate a disorder of the liver.
At present it is generally admitted that alterations in the color of the skin during pregnancy are due to deposits of iron. This mineral substance, among others, as we have learned, is required for the development of the embryo. The child is born with a supply of iron calculated to meet its needs for about a year. Such a reserve is necessary, as Bunge has pointed out, because human milk does not contain enough iron to satisfy the infant's requirements. During pregnancy, therefore, the mother's blood transports iron to the placenta, where it can be absorbed into the child's system; and while being thus transported some of it is deposited in the maternal tissues. The deposits are especially frequent, as I have mentioned, in the middle line of the abdomen, on account of the arrangement of the blood vessels there. Deposits elsewhere may depend upon other conditions; but whatever their cause the pigmentation vanishes a short time after the birth.
Alterations in the color of the skin have no effect upon its excretory function, which, indeed, generally becomes more active during pregnancy. According to one estimate, the average person possesses twenty-eight miles of sweat glands. If these figures are not sufficient to demonstrate the importance of the skin as an excretory organ, surely no one will fail to be impressed by the tragic result which in one case followed throwing all the sweat glands out of action. This was brought about in the case of a young boy whose body was covered with gold leaf to provide entertainment at a Parisian festival. The living statue was not exhibited, however, for shortly after the youth was gilded he became ill and died.
In health more than a pint of water is eliminated through the skin every day, and along with it waste products are removed from the body. Exercise, hot drinks, warm weather, and heavy clothing promote the activity of the sweat glands. Under certain circumstances physicians endeavor to relieve the kidneys by stimulating their patients to perspire freely. It should be clear, therefore, that when a prospective mother naturally perspires it is a good indication. Attempts to stop the perspiration are always ill advised; rather should this function be encouraged by keeping the skin in good condition with baths and warm clothing.
BATHING.—The accumulation of dead skin, grease, dust, and dried perspiration on the surface of the body hinders the actions of the sweat glands. Some of this material is wiped off by the clothing, and more of it is removed by washing with plain water; but the most effectual cleansing results from a liberal use of warm water and soap.
Since the prospective mother must throw off the waste products of the embryo as well as those of her own body, it is obvious that cleanliness is never more important than during pregnancy. For this reason she should take a tepid tub bath or shower every day. It is not necessary that the temperature of the bath be determined with accuracy or that it be always the same; but generally a temperature between 80 and 90 degrees F. is found most agreeable. At this temperature a bath is termed "indifferent," because it is neither stimulating nor depressing; it is employed purely for cleansing the body. Every part of the body should be well soaped, and from ten to fifteen minutes should be given to washing all the exposed surfaces. The best time for such a bath is just before going to bed, though there is no objection to taking it during the day, provided that two hours have passed since the last meal, and that another hour is permitted to elapse before one goes out of doors or undertakes anything that requires exertion.
Prolonged hot baths are fatiguing. They draw the blood from the interior to the surface of the body; and during pregnancy they are particularly depressing. Vapor and steam baths have a similar action and should never be taken without the consent of a physician. They serve admirably for the treatment of rare complications of pregnancy; but, like medicine, their use should be limited to cases in which they are clearly indicated.
Unless disagreeable results are noticed, those who have become accustomed to cold baths may continue to take them during pregnancy, but others should not. If, however, the temperature of the water is modified so that it will not produce a shock, no one need omit the morning plunge or shower which most persons find invigorating. Sponging answers the same purpose, for the intent of the morning bath is not to cleanse the body but to arouse the circulation. A thorough rub-down assists in bringing the blood to the surface of the body. Bath and massage together thus constitute a kind of skin gymnastics especially beneficial throughout pregnancy.
Although hot foot-baths have sometimes been thought to cause miscarriage, there is no good reason for believing they ever do. Sea- bathing, on the contrary, may be directly responsible for such a mishap. It is true that pregnant women sometimes indulge in surf- bathing without harmful results; nevertheless the danger of miscarriage they assume is not slight. The shock of the low temperature, the exertion required to keep a firm footing, and the pounding of the surf against the abdomen are all unfavorable influences which more than counterbalance any advantage of such a bath. On the other hand, there is slight risk if any in bathing in a quiet stream or lake.
DOUCHES.—A great many women have the conviction that the vagina is not clean and should, therefore, be regularly cleansed by means of irrigations. This assumption is false and the treatment based upon it is unnecessary. In structure the walls of the vagina closely resemble the skin, but unlike the skin they do not contain glands; the vagina, therefore, has nothing to do with the elimination of waste products from the body. The secretion which issues from the vagina really originates in the glands around the mouth of the womb, and serves to protect the birth-canal against infection from harmful bacteria.
Careful examinations have shown that under normal conditions, which of course include pregnancy, disease-producing bacteria are absent from the vagina; in this respect the vagina is even cleaner than the skin, for disease-producing bacteria are present on the surface of the body. The vaginal secretion becomes more abundant during pregnancy, and the increase is interpreted as an additional guarantee against infection at the time of labor. So far as possible, therefore, this natural antiseptic should not be disturbed.
The advice to abstain from douches will not be adopted by every prospective mother without protest, for, as I have said, many women regard them as necessary to cleanliness. Others who have delicate skins are occasionally annoyed by the irritation of the vaginal secretion, which is not only increased during pregnancy but has a more pronouncedly acid character. Under extraordinary circumstances, it may be permissible to use douches in the early part of pregnancy, but it is practically never advisable to do so during the month preceding the expected date of confinement. Furthermore, at no time should the use of douches be begun without consulting a physician.
A more rational hygienic measure for the relief of itching and smarting about the vaginal orifice consists in removing the secretion as soon as it appears. In other words, the external parts should be kept clean and dry. Great comfort is often derived from the use of a "sitz-bath," which may be easily prepared by placing a small tub upon a low stool and pouring in warm water (about 90 degrees F.) until it is five or six inches deep. Cold sitz-baths are useful in the treatment of hemorrhoids. Whether the bath be hot or cold, the treatment should continue from ten to fifteen minutes, and after it the skin should be thoroughly dried.
A special form of tub, called a "bidet," has been devised to facilitate bathing the parts in question. The device is convenient but expensive, and is certainly not essential. Every purpose will be served by the small tub, provided the desired temperature of the bath is properly maintained by changing the water as may be necessary.
CLOTHING.—In these days at least it is not idle to remark that the first use of clothes is to keep the body warm; all other services they are made to perform are secondary and relatively unimportant. There are very good reasons, to be sure, for dressing neatly and even for dressing in accord with the fashion, so long as the prevailing styles are not harmful. Odd as it may seem, these are matters which are not without significance for the physical well-being of a prospective mother. Neat and comfortable clothing will help her to overcome a natural inclination to become a "stay-at-home," and on this account an inconspicuous way of dressing is often more valuable than medicine. So long as they do not attract attention, most prospective mothers go out in the day time, mingle with their acquaintances, and attend public places of amusement. Deference to fashion, therefore, may contribute substantially to good health.
Yet no prospective mother can afford to forget that first of all her clothing must keep the body warm. Our clothing confines a cushion of air which prevents the escape of the heat that we generate. Now, since dry air conducts heat poorly and moist air conducts it readily, the underclothes should be made of material that absorbs the perspiration; otherwise the heat that the body generates is quickly lost. Woolen garments effectually absorb the perspiration and should be given the preference. Most persons who cannot wear wool next the skin must choose cotton, since silk and linen are much more expensive; there is not in this, however, a serious deprivation. Cotton undergarments are perfectly hygienic; adapting their weight to the season of the year, one will find them equally satisfactory in summer and winter.
Except in summer every inch of the body should be covered with the underclothing; this means that high-neck and long-sleeve shirts and long drawers should be worn, for healthful activity of the skin can thus be best preserved. It is well known to physicians who practice obstetrics that the kidneys fail in their work more frequently during the winter than the summer. To my mind, this is chiefly explained by the way women dress. Even with light clothing the sweat glands respond actively to the heat of summer and thus relieve the kidneys, but in cold weather the sweat glands will not remove their share of the waste products unless the clothing is warm.
Nature generally indicates that the body should be kept warm during pregnancy. Many prospective mothers complain of perspiring freely; others, if reproached because they are not clad warmly enough, reply that they must wear light clothing to keep from perspiring. Thus they discount or render absolutely ineffective a most important natural safeguard against serious complications. It cannot be too strongly emphasized that warm clothing helps to maintain healthful activity of the kidneys quite as much as a proper amount of exercise and the drinking of a suitable quantity of water.
The texture of the outer garments should take into account this same quality of warmth; in other respects in selecting them personal taste is an excellent guide. Outfitters carry a variety of maternity garments; patterns for such garments are also sold by dealers, so that those who cannot afford the ready-made clothes will find it easy to have them made at home. Alterations in the clothing are compulsory as pregnancy advances, and should be timely, made in anticipation of inevitable development rather than in response to it. No prospective mother need go to the extreme of "Reform Clothes"; her apparel should illustrate both her good sense and her personal pride.
It is obviously even more harmful during pregnancy than at other times to cramp the body by the clothing; the chest and the abdomen, the parts most likely to be compressed, are at such times most in need of freedom. To a slight degree natural causes always compress the chest from below upward; and on this account nothing should be allowed to hamper the expansion of the lungs from side to side. On the other hand, if the waist is constricted, not the breathing movements alone but also the growth of the womb will be interfered with. In order to avoid such disagreeable consequences, and at the same time to limit the extent of the maternity wardrobe, skirts may be fitted with practical devices which permit letting out the waistband as occasion demands. So far as possible, however, all the clothing should be hung from the shoulders, and under no circumstances should heavy skirts be worn.
Shoes contribute toward health, or the lack of it, more significantly than the average person realizes. It is particularly advisable that prospective mothers should select foot-wear with care, because their bodies are heavier than usual. The feet are apt to become swollen in the latter months of pregnancy, and consequently the shoes should be roomy, but should always fit. To escape the discomfort of tight shoes, it is generally advisable to wear a shoe an inch longer and broader than the foot at rest.
High heels have been proved a frequent cause of back-ache; half of such cases, in all probability, may be thus explained. High heels tilt the body forward in such a way that the erect posture can be maintained only by an unnatural tenseness of the back-muscles. Some strain of this kind is inevitable during the latter months of pregnancy on account of the enlargement and the position of the womb; it is reasonable, therefore, to minimize it by wearing low, broad heels.
Besides being responsible for many cases of backache, high heels add greatly to the danger of tripping and falling; for this reason alone they should not be worn. Improper foot-gear and not the joints themselves deserve the blame for weak ankles. To prevent "turning the ankle," it is not necessary to restrict oneself to high shoes, but merely to see that the shoes that are worn have low heels and broad soles. Such shoes provide a sure, firm footing, and this the prospective mother particularly needs.
CORSETS.—No question connected with women's dress has provoked so much discussion as the use of corsets. "Are corsets necessary to health?" has been differently answered by those who would appear to be equally competent authorities. In the time of our savage ancestors we may safely conclude that they were not used; and, therefore, it is really a question as to whether their continued use for generation after generation has finally made some support of this kind indispensable to the average woman. While that matter has not as yet been settled, it is obvious that custom is really responsible for the conviction of many women that they appear slovenly without corsets. On the other hand, not a few women, unmindful of fashion, never wear them; they testify that they are healthier for doing so. Whether this be true or not, no one can honestly believe that corsets will soon be banished; and the practical problem is to distinguish between those that may do good and those certain to do harm.
During pregnancy the abdomen tends to fall forward and slightly downward, and though it is in pregnancies after the first that this tendency is most marked, every prospective mother will be more comfortable if she wears some sort of support to counteract what physicians term a "pendulous abdomen." Such a condition can be prevented by the use of several appliances, and the device best suited to the case should be chosen. Those who have never become accustomed to corsets will probably find a corset-waist or an abdominal supporter the most comfortable and useful. But the average young woman who has previously employed a sensible, well made, and loosely fitting corset need make no change until the third or fourth month of pregnancy. From then on she should wear a corset especially designed to conform with the changes that naturally occur in the figure.
There is a plan, wrong in principle, which many adopt. Reasoning that it will be necessary to change the corset from time to time, and desiring to practice economy, a number of women purchase the cheapest corset at hand. This they replace with a larger one of the same style from time to time. The result is that an improperly fitting garment is worn continuously; and, in the end, this plan proves almost as expensive as, and far less suitable than, a proper corset, which would remain serviceable throughout pregnancy, or at least until a few weeks before confinement.
Most, and probably all, of the injuries for which corsets are responsible result from their misuse. Naturally serious consequences may be expected if they are worn with the design of compressing the abdomen so as to render pregnancy less noticeable or perhaps to conceal it altogether. Thus worn, the corset becomes not only an instrument of torture but a source of danger both to the mother and to the child. Fortunately there are very few women who fail to appreciate the risk of thus striving to disguise their condition; and generally it is the needless discomfort, the trifling ills thoughtlessly inflicted upon themselves, that prospective mothers must be taught to avoid.
At present there are manufactured a number of excellent maternity corsets; but there are also worthless types, and some likely to do harm. To judge them fairly they must be examined with regard to several requirements. In the first place the corset should not be stiff and should always be capable of easy adjustment; it must never interfere with the activity of any organ. As enceinte, the French word meaning pregnant, signifies, the prospective mother should be unbound. Tight clothing, as we have already remarked, hinders the breathing movements; it also interferes with the action of the heart, and occasionally causes the child to assume an unfavorable position within the uterus. The adjustment of the maternity corset to the progressive development of the body is generally provided for by means of extra lacings down the sides, and by the insertion of elastic material.
The maternity corset, in the next place, must support the enlarged uterus. Correctly shaped and worn, it extends well down in front, fits snugly around the hips, and arches forward so as to conform to the curve of the abdomen. In place of the arching, or "cupping" as manufacturers call it, some maternity corsets have attached to their lower edge limp flaps of a strong fabric which lace together. The maternity corset-waist also should extend well under the abdomen and fit snugly around the hips.
Finally, the corset should support the bust; the unpleasant sensations due to congestion of the breasts can be relieved most successfully by elevating them. It is exceedingly important, however, that the upper part of the corset should fit loosely, for otherwise the development of the breasts may be hindered, and the nipples depressed. As a further precaution against pressure above and also to secure the proper amount of support below, it is generally advisable to begin putting on the corset while lying down. In every case the corset should be laced from below upward; if laced in the opposite direction it fails to lift the womb and tends to push all the abdominal organs downward.
Any kind of corset is likely to become uncomfortable toward the end of pregnancy; and of course should then be discarded. An abdominal supporter made of woven linen or rubber is frequently used to advantage during the last three or four weeks. With the first pregnancy the supporter is rarely necessary, but with subsequent ones it is frequently useful as early as the sixth month and is indispensable later. A substitute for the manufactured supporter can be made at home. Some such device often facilitates turning in bed, and on that account may be found even more useful at night than during the day.
THE BREASTS.—Personal hygiene during pregnancy includes the preparation of the breasts with a view to success in nursing. All measures which promote the health of a prospective mother also serve to equip her for the nursing period; and in that sense the directions just given for the care of the body, as well as the rules to follow in the next chapter regarding a wholesome way of living, bear directly upon lactation. But there are also local measures to be adopted, some of which, such as supporting the breasts and avoiding constriction by the clothing, have already been mentioned. Finally, the nipples must be toughened and, if short or flat, they must be drawn out, for the best supply of milk will count for nothing if the infant cannot nurse comfortably.
Some approved method of toughening the nipples so that they will not be injured by the sucking efforts of the infant, no matter how vigorous, should be begun eight weeks before the expected date of confinement; to start earlier will do no harm, but it is quite unnecessary. A number of procedures have been advocated, but in my own experience the following simple method is the best. The nipples are scrubbed for five minutes, night and morning, with soap and warm water. Generally, a soft brush, such as a complexion-brush, is satisfactory; but if this is too harsh, at first a wash cloth may be used. After having been thoroughly scrubbed the nipples are anointed with lanolin and covered with a small square of clean, old linen to prevent soiling of the clothing.
Another method widely used, but somewhat less trustworthy, consists in bathing the nipples and applying a dilute solution of alcohol. Formerly brandy, whiskey, or cologne were recommended, but at present the following solution is commonly used. A tablespoonful of powdered boric acid is added to three ounces of water and thoroughly mixed. This is poured into a six-ounce bottle, which is then filled with grain alcohol (95 per cent). The solution is applied twice a day with a small piece of absorbent cotton.
Well-formed nipples need only be toughened, but depressed nipples require additional treatment; and this should be begun about the middle of pregnancy. The old-fashioned way of making the nipple more prominent was to cover it with the mouth of a bottle which had previously been warmed. The vacuum created, as the bottle cooled, drew the nipple out. Similarly, the bowl of a clay pipe was sometimes placed over the nipple; the patient sucked the stem, the nipple was drawn into the bowl, and with persistence day after day success was often attained. A similar and somewhat more aesthetic procedure is now employed. The nipple is seized between the thumb and finger and alternately pulled out and allowed to retract. These manipulations, if faithfully practiced for several months, generally make the nipple prominent enough for the infant to grasp. Occasionally patients need to wear a contrivance sold at instrument stores which consists of a circular piece of wood modeled to fit the breast and perforated in the middle to accommodate the nipple. The appliance should not be used unless a physician thinks it necessary.
Directions regarding the care of the breasts are sometimes taken lightly, yet such care is not a minor duty. Now and then a patient will pass through pregnancy uneventfully, will be delivered without difficulty, and will enter upon what promises to be a rapid convalescence when her recovery is interrupted by the development of inflammation of the breast. Because such a complication may be prevented, its appearance is the more to be regretted. Furthermore, the responsibility for its prevention usually rests with the patient herself. If she has been conscientious in preparing the nipples and continues to watch them throughout the nursing period, the annoyance of an abscess will almost certainly be prevented.
CHAPTER VI
GENERAL HYGIENIC MEASURES
The Need of Fresh Air—Outdoor Exercise—Massage and Gymnastics—The
Influence of Work upon Pregnancy—Relaxation and Rest—Is Traveling
Harmful?—Mental Diversion.
Besides the hygienic measures described in the preceding chapter, whose observance should be recognized as more or less obligatory, there are more general questions of conduct, such as exercise, relaxation, mental occupation, and amusement, which are also important. These measures, although frequently determined merely by personal inclination or by the force of circumstances, nevertheless exert a tremendous influence upon health. This fact a prospective mother is likely to realize, for she is certain to consider not only her own welfare but also that of the expected child; and she is consequently concerned about details of conduct that most persons would regard as trivial. She may, indeed, be too conscientious. Well- meaning friends, sometimes in reply to her questions and sometimes without solicitation, offer her a great deal of advice. Their counsel, aside from the fact that some of it may be misleading, may have the effect of prescribing so many rules that, if she followed them all, she would never lose sight of the fact that she is pregnant. Such a degree of self-consciousness is certain to make her unduly apprehensive. The proper attitude of mind is quite the opposite; so far as possible the prospective mother should forget that she is pregnant. This state of mind is really the more rational, for if a woman's daily life has previously been in accord with such simple rules of health as everyone should adopt, the existence of pregnancy calls for very slight changes.
It does not, for example, condemn her to inactivity and seclusion, for it is advisable to lead a moderately active life during pregnancy. Of course, such obvious indiscretions as prolonged exertion, violent exercise, and fatiguing journeys should be avoided, for transgression of the laws of health brings its own punishment, generally in the form of discomfort, more quickly, and often more severely, during pregnancy than at other times. Yet, on the whole, it is more frequently necessary to emphasize to prospective mothers what they should do than what they should avoid. This happens to be the case because, as a rule, they are inclined to become recluses. For fear of attracting attention they often wish to give up outdoor exercise during the day; they stay away from public places of amusement, and deny themselves other pleasures to which they have been accustomed. Against this tendency they must be warned, for if they yield to it they will surely be the worse off both physically and mentally. Every prospective mother should make up her mind to enjoy recreation out of doors regardless of comments.
THE NEED OF PURE AIR.—Outdoor life has been so urgently advocated of late that the public has come to appreciate its benefits almost as fully as do physicians. The existence of pregnancy does not lessen, but rather enhances, the value of fresh air; in order to enjoy the best health during this period one should spend at least two hours out of doors every day. Neither the season of the year nor the state of weather should modify this obligation. If the sun is shining the "airing" is more delightful, but it should be taken in bad weather also, on a protected porch or in a room with the windows wide open.
Even when the injunction to be regularly out of doors is observed women are accustomed to spend the greater portion of the day in the house, and on that account special attention must be given to keeping the air of the house pure. Ventilation takes care of itself in summer, when the windows are open, but in cold weather, when in our anxiety to keep the temperature comfortable we may overlook the need of fresh air, it demands close attention. The necessity of ventilation at all times is due, of course, to the composition of the atmosphere and to the changes produced in it as we breathe.
The air about us is a mixture of gases, of which oxygen and nitrogen are the most important. Although nitrogen, which constitutes four- fifths of the atmosphere, is taken into our lungs in breathing, we make no use of it, but breathe it out in precisely the same condition as we take it in. As chemically combined in the food-stuff known as protein, nitrogen is indispensable to animal life; but our bodies make no use of the gaseous form of nitrogen. Oxygen, on the other hand, supports life; and though it forms less than one-fifth of the atmospheric air, it is present in ample amount for our needs. After we draw air into our lungs, the oxygen it contains is absorbed by the blood and used by the tissues. In return our tissues give up a waste product, carbonic acid gas, which is thrown off by the lungs. It is interesting to observe that the carbonic acid gas which animals exhale supports the life of plants, and that the plants, under the influence of sunlight, give back pure oxygen to the atmosphere. Obviously, the complementary relation exhibited here is of mutual benefit.
The average person uses about four bushels of air a minute. Consequently, rooms that are occupied must be constantly replenished with fresh air; otherwise the point is quickly reached where the occupants are breathing an atmosphere that is not only poor in oxygen but saturated with carbonic acid gas and other impurities conveyed by the breath. Foul air such as this causes headache, dizziness, faintness, nausea, and occasionally even more serious disturbances. Those who live in "close" rooms day after day grow pale and languid; their appetite fails and some of their natural power of resistance against illness is lost. Many people are unhealthy simply because they neglect to supply their living quarters with a steady stream of air from the outside.
While it is impossible to keep the air in any room as pure as the outside atmosphere, perfectly satisfactory ventilation can be easily arranged. Some of the impure air in a house is always escaping of its own accord and its place is taken by air from the outside. Thus, the cracks around the windows and doors let bad air out and good air in; and, besides, most building materials are porous. These natural paths, however, must be supplemented. The simplest device for ventilation, which is also the best, consists in opening a window at the top and bottom. The width of the opening may be regulated so as to permit the air in the room to change without occasioning disagreeable drafts; if necessary the current may be broken by a screen of some pervious material placed in the opening.
The bed-room should always be supplied with plenty, of fresh air, which "quiets the nerves" and helps one to sleep soundly. Furthermore, the temperature of the bed-room should be lower than the temperature of rooms occupied during the day. Both these requisites will be properly met by leaving a window open at night, which may be done throughout the year in most climates, if one puts on enough covering. There is no danger of catching cold from sleeping with the window open; on the contrary, breathing fresh air day and night is one of the best ways to prevent colds.
OUTDOOR EXERCISE.—Outdoor exercise is indispensable to good health. It benefits not only the muscles, but the whole body. By this means the action of the heart is strengthened, and consequently all the tissues receive a rich supply of oxygen. Exercise also promotes the digestion and the assimilation of the food. It stimulates the sweat glands to become more active; and, for that matter, the other excretory organs as well. It invigorates the muscles, strengthens the nerves, and clears the brain. There is, indeed, no part of the human machine that does not run more smoothly if its owner exercises systematically in the open air; and during normal pregnancy there is no exception to this rule. Only in extremely rare cases—those, namely, in which extraordinary precautions must be taken to prevent miscarriage—will physicians prohibit outdoor recreation and, perhaps, every other kind of exertion. Under such circumstances the good effects that most persons secure from exercise should be sought from the use of massage.
The amount of exercise which the prospective mother should take cannot be stated precisely, but what can be definitely said is this— she should stop the moment she begins to feel tired. Fatigue is only one step short of exhaustion—and, since exhaustion must always be carefully guarded against, the safest rule will be to leave off exercising at a point where one still feels capable of doing more without becoming tired. Women who have laborious household duties to perform do not require as much exercise as those who lead sedentary lives; but they do require just as much fresh air, and should make it a rule to sit quietly out of doors two or three hours every day. It will be found, furthermore, that the limit of endurance is reached more quickly toward the end of pregnancy than at the beginning; a few patients will find it necessary to stop exercise altogether for a week or two before they are delivered.
Walking is the best kind of exercise, but long tramps are inadvisable during pregnancy, except for those who have previously been accustomed to them. Most women who are pregnant find that a two or three-mile walk daily is all they enjoy, and very few are inclined to indulge in six miles, which is generally accepted as the upper limit. Perhaps the best way to measure a walk is by the length of time it consumes. Accordingly, a very sensible plan is to begin with a walk just long enough not to be fatiguing and to increase it by five minutes each day until able to walk an hour without becoming overtired. It is always advisable not to crowd the exercise of a day into a single period but rather to take it in several installments, for example, an hour in the morning, and another in the afternoon. Under all circumstances, it must never be forgotten that the feeling of fatigue is a peremptory signal to stop, no matter how short the walk has been.
Very few outdoor sports can be unconditionally recommended to a prospective mother. Because athletic exercise is either too violent or else jolts or jars the body a great deal, it is especially dangerous in the early months of pregnancy—the only time when it is likely to be at all attractive. Croquet, alone, perhaps, is free from these objections. Although golf and tennis are by no means certain to bring on miscarriage, they involve a risk which, slight though it may perhaps be, will not be assumed by cautious women.
Horseback riding during pregnancy is injurious. We occasionally hear of women who have ridden horseback without immediate harmful consequences, but they have nevertheless exposed themselves to danger unnecessarily. It is better to give up skating and dancing also than to run the risk of accident, especially since these diversions are attended with some danger of falling. In a general way, whenever the question of entering into any kind of recreation must be decided, it is wise to err on the conservative side rather than risk overstepping the limit of endurance and having to pay a penalty more or less severe.
Carriage riding cannot take the place of walking and can scarcely be classed as exercise; it is wholesome, nevertheless, because it takes the participant out of doors and provides a change of scene. Certain details, however, should be carefully observed; thus, a safe horse, a carriage that rides easily, and smooth roads should be selected. Similar advice pertains to motoring; with smooth roads, a cautious driver, and a comfortable machine, short rides in an automobile are not harmful. Carriage riding and motoring are particularly serviceable as a means of getting outdoor diversion during the last few weeks of pregnancy.
MASSAGE AND GYMNASTICS.—If a prospective mother is obliged to stay in bed several weeks, massage may be useful; otherwise there is no necessity for this treatment. Whenever required, massage should if possible be given by an experienced masseuse. If this is out of the question and the patient must rely upon one of her friends, it should be understood that "general massage" is needed; in other words, one part of the body after another should be gone over systematically. With an inexperienced masseuse, however, it will be safer not to massage the abdomen, since awkward, vigorous, or prolonged manipulations in that locality may provoke painful uterine contractions. Rubbing the breasts also can do no good; on the contrary, it may do harm by bruising them.