1.Does the age of childbirth have any effect on the fetus? The answer is yes. Physiologically, the reproductive organs of women generally develop gradually after the age of 20, while the bones of the whole body, such as the calcification of teeth and the emergence of wisdom teeth, are not completed until after the age of 23. The development and maturation of male reproductive function is later than that of female. Therefore, if you get married too early and have children, the mother’s body is rapidly developing and cannot supply the fetus with a large amount of nutrients needed for growth and development, such as protein, carbohydrates, vitamins, inorganic salts, trace elements, etc., which can affect the physical and intellectual development of the fetus. At the same time, the number of sperm produced by early marriage and early childbirth is low, low quality, and prone to sperm mutilation, chromosomal abnormalities, etc., which is obviously not conducive to embryonic development, affecting eugenics. 2, the best age of pregnancy for women is 23-29 weeks old, and the age of the spouse is 25-30 weeks old. Pregnancy around the age of 20 is more problematic, for one thing, young, do not have the ability to be a mother, neither self-protection, and can not bring up children; secondly, the economy is not yet independent, to rely on parents. If you are unmarried and pregnant first, it is even more difficult, often afraid to reveal the truth for help, often resulting in nutritional deficiencies, resulting in the birth weight of the newborn baby decreased and affect the physical and intellectual development, or due to poor maintenance and a variety of unexpected problems. The best age for first pregnancy should not exceed 30 years old. This is because before a woman is born, her egg cells are stored in her ovaries, and if she becomes pregnant too late, her eggs will be too old and will be more affected by environmental pollution, which can easily lead to aging of the chromosomes of the eggs, resulting in a higher rate of malformations. At the same time, due to the reduced elasticity of the birth canal in older women, prolonged labor and surgical assistance are likely to occur, which inevitably also affects the health of the fetus to some extent. According to statistics, the incidence of congenital fetus is 1/5000 among mothers aged 25-29 years; 1/1800 among mothers aged 30-40 years; 1/900 among mothers aged 35-39 years; and as high as 1/120 among mothers aged 45 years or above, which shows that there is a certain relationship between women’s childbearing age and the health of the fetus. Similarly, when men marry at an older age, the genetic mutation rate of sperm increases accordingly, and the quantity and quality of sperm are not guaranteed, which is also very unfavorable to the health of the fetus. It is believed that the father’s age at childbirth is related to the occurrence of congenital stupidity, and it is even believed that 25% of congenital stupidity patients are caused by the father’s side. Therefore, from the perspective of eugenics, it is inappropriate to have children too early or too late. The best age for women to marry and raise children is after the age of 23, which is the most favorable age for future parents in terms of work, study, health, economic strength, physical strength, and energy.