1. Does reproductive age have an effect on the fetus? The answer is yes. Physiologically, the reproductive organs of women generally develop and mature after the age of 20, and the bones of the whole body, such as the calcification of teeth and wisdom teeth, will not be completed until after the age of 23. The development and maturity of male reproductive function is even later than that of female. Therefore, if you get married and have children too early, the rapid development of the mother’s body will not be able to supply a large number of nutrients needed for the growth and development of the fetus in a timely manner, such as proteins, carbohydrates, vitamins, inorganic salts, trace elements, and so on, so as to affect the fetus physique and intellectual development. At the same time, early marriage and early childbearing men produce less sperm, low quality, and prone to sperm mutilation, chromosomal abnormalities, etc., obviously not conducive to the development of the embryo, affecting eugenics. 2, the best age for a woman to get pregnant is 23-29 weeks old. The age of the spouse is 25 to 30 years old. Around 20 years of age once pregnancy is more problematic, first, young, do not have the ability to be a mother, neither self-protection, nor with children; secondly, the economy is not yet independent, to rely on parents. If unmarried first pregnancy is even more difficult, often do not dare to expose the truth for help, often leading to nutritional deficiencies, resulting in newborn birth weight loss and affect the physical and intellectual development, or due to poor maintenance and a variety of unexpected problems. The age of first pregnancy should not exceed 30 years old. Because before the birth of a woman, egg cells have been stored in the ovaries, pregnancy time is too late, the age of the egg is too old, by the impact of environmental pollution is more likely to occur in the egg chromosome aging, resulting in teratogenicity rate increases. At the same time, due to the lower elasticity of the birth canal of elderly women, easy to prolong the labor process and surgical delivery and other cases, is bound to affect the health of the fetus to a certain extent, according to statistics, the incidence of congenital stupidity of the fetus 25-29 years of age of the maternity of 1/5000; in the 30-40 years of age of the maternity of 1/1800; in the 35-39 years of age of the maternity of 1/900; and in the 45 years of age of the maternal Maternity is as high as 1/120, enough to show that the reproductive age of women and the health of the fetus is a certain relationship. Similarly, when a man is too old to get married, the rate of genetic mutation of sperm also increases accordingly, and the quantity and quality of sperm cannot be guaranteed, which is also very unfavorable to the health of the fetus. Some people believe that the father’s reproductive age is related to the occurrence of congenital stupidity, and even believe that 25% of congenital stupidity patients are caused by the father’s side. Therefore, from the point of view of eugenics, it is inappropriate to give birth too early or too late. From the consideration of various factors such as work, study, health, economic strength, physical strength, energy and so on, it is most favorable for a woman to get married and raise children after the age of 23, which is the optimal age for marriage and childbearing.