Physiologically speaking, It is best for women to have children around the age of 20: It is easy to get pregnant, give birth quickly and smoothly, recover quickly after delivery, and have few birth defects. Having children at this age is really like bearing fruit on a tree. As soon as it is ripe, it falls off. However, Women in this age group are often not mature enough in their psychological age, May not have finished their studies, Without a stable job, It is not appropriate to have children so early. On the whole, The more suitable age for giving birth is about 25-28 years old, If for the sake of career development, A few more years will be fine, But try not to delay until after the age of 35. During the intrauterine period, All the eggs of the female fetus have completed their first meiosis. So she was born with all the eggs in her life. Her birthday is the [date of birth] of all her eggs. Like food, Eggs also have a shelf life, The quality of eggs after 20 years of production and 35 years of production is different. The quality of eggs after 20 years of production is different from that after 35 years of production, [Factory] 45-year-old eggs have basically passed their shelf life. Women begin to ovulate after entering puberty, As one grows older, The total number of eggs is gradually decreasing. In addition, As women grow older, The eggs are aging, The percentage of egg cells with normal genes is gradually decreasing. Therefore, As one grows older, The fertility rate of women will decline, Abortion rates have increased, The probability of birth defects such as Down’s syndrome increases. Women in their 20s who are pregnant in their 20s have normal ovarian function. There are more healthy egg cells in it, Therefore, it is easier to conceive, Their chances of getting pregnant every month are about 20-25%, If women in this age group fail to succeed after 12 months of active attempts to conceive, You should seek the help of a reproductive expert. The spontaneous abortion rate of women in their 20s after pregnancy is only 5-10%, The incidence rate of Down’s syndrome is about 1/1200. In the early 30s, when pregnant and over 30 years old, Women’s fertility will decline, Their monthly pregnancy rate is about 15%, If women in this age group fail to succeed after 9 months of active attempts to conceive, You should seek the help of a reproductive expert. The probability of miscarriage after pregnancy for 30-year-old women is about 20%, The risk of Down’s syndrome is about 1/952. If a woman over 35 wants to become pregnant, There will be many problems. Women over 35 are significantly less likely to become pregnant every month. Only about 10%. If women in this age group fail to succeed after actively trying to conceive for 6 months, You should seek the help of reproductive experts. After 35-year-old women become pregnant, the abortion rate is 25%, and the risk of Down’s syndrome becomes about 1/378. The difficulties and risks faced by giving birth to children after 40 and 45 years old will be even greater. For specific risk data, please refer to another article of mine [giving birth to a second child at an older age]. To sum up, to give birth to a baby, it is better to be in your twenties as early as possible.