Fertility in women is the basis of the fecundity of a nation, of its growth, its power, and its importance. It is especially the fertility of married women which enters here into consideration, and forms the source of the statistical data of fertility; these are usually obtained by drawing a ratio between the number of marriages contracted in a given period, and the number of children born in the same period.
The fertility of women is a function beginning at an age varying in dependence on many conditions, and undergoing extinction at a definite period of life. It is, in fact, associated with the duration of the sexual life of woman, and, generally speaking, extends from the sixteenth to the fiftieth year of life. Climate, race, constitution, and morbid conditions, influence alike the first appearance of menstruation and the first pregnancy; and as they influence the duration of menstrual activity, so also do they influence the duration of fertility.
In the Bible are recorded numerous instances of the early commencement of fertility. At the present time also, in warm climates we meet with many examples of early motherhood. From the great work of Ploss-Bartels, from which we have already frequently quoted, we extract and summarize the following ethnographical details. Among the wives of the Bosjesman, mothers aged ten are frequently seen; travellers in New Zealand often saw mothers of eleven years, and mothers of the same age among the Samoyedes and in Palestine; mothers of twelve in British Guiana, in Jamaica, among the Schangallas, at Shiraz in Persia, among the Copts in Egypt; mothers aged thirteen in Cuba, among the Sioux and the Dakotas, and in New Caledonia; mothers aged fourteen among the Negroes of Gaboon.
According to the observations of Robertson, of sixty-five Indian women there gave birth for the first time:
| At the age of 10 years | 1 |
| At the age of 11 years | 4 |
| At the age of 12 years | 11 |
| At the age of 13 years | 11 |
| At the age of 14 years | 18 |
| At the age of 15 years | 12 |
| At the age of 16 years | 7 |
| At the age of 17 years | 1 |
Moreover, in the records of European countries, we find numerous instances of very early motherhood. Molitor’s case, a girl nine years old giving birth to a vesicular mole with an embryo; von Haller’s case, pregnancy in the ninth year of life; Carus’ case, pregnancy at the age of eight. Caspar saw a girl in Berlin who became pregnant at the age of twelve, and was delivered of a living child. Rüttel saw a girl nine years of age pregnant. King attended the confinement of a girl who at the time of her delivery was not yet eleven years old. Taylor reports the case of a girl twelve years and six months of age who was then in the last month of pregnancy. Koblanck attended a girl of fourteen who was delivered of a child weighing four and a half pounds.
In most of these cases the premature fertility is followed by a premature cessation of fertility. And there is more or less truth in Bruce’s statement regarding the Arab women in Africa, that those who began to bear children at the age of eleven were seldom still fertile at the age of twenty.
At times we may observe a remarkable extension of fertility beyond the average age, that is, beyond the age of fifty years.
In northern Europe pregnancy at a comparatively advanced age is by no means rare. From the official statistics of Denmark we learn that among 10,000 women, 465 were delivered at ages between 50 and 55 years. In Sweden, of 10,000 mothers, 300 gave birth to children when more than 50 years of age. In Ireland, the proportion of mothers over 50 was 345 per 10,000. In England the official figures dealing with the delivery of 483,613 women, showed that 7,022 were between 45 and 50 years of age, and 167 over 50 years of age.
The Surgical Academy of Paris, in an authoritative statement regarding the late age at which conception could take place, alluded to the fact that Cornelia, of the family of the Scipios, gave birth to Volusius Saturninus when sixty years of age, that the physician Marsa in Venice recorded the existence of pregnancy in a woman of sixty, that de la Motte recorded pregnancy in a woman of fifty-one, and that he believed it to be true that another Parisian woman had given birth to a girl at the age of sixty-three, and had herself suckled the infant.