The age of childbirth is being delayed in China and around the world, and records are being set for the oldest age of childbirth. Is there really no harm in delaying childbirth? When is the best age for women to have children? From an obstetrics and gynecology perspective, women between the ages of 18-45 are considered to be of childbearing age. In fact, women have the ability to conceive after menarche, and it is not uncommon now for women to give birth after the age of 45. It is only that women who ovulate irregularly or have poorly developed eggs before the age of 18 versus after the age of 45 have a lower chance of conceiving. In fact, fertility decreases with age. Studies have shown that about 57% of women of childbearing age conceive after 3 months of cohabitation without contraception; about 70% conceive after 6 months of cohabitation; 85% after 1 year, and 93% after 2 years. Undoubtedly, age is one of the most important factors affecting fertility and is not related to race. A study was conducted on a tribe living in the border area between the United States and Canada. There, contraception is prohibited. Of the 209 women surveyed, only 5 had never given birth; of those who did, 11% were infertile after age 34; 33% were infertile at age 40; and 87% were infertile after age 44. If we exclude the effect of frequency of intercourse on conception, what are the results? Some scholars have specifically studied the pregnancy situation after artificial insemination, they found that the conception rate before the age of 31 is about 74%, 31-35 years old is 61. 5%, greater than 35 years old is 53. 6%. It is evident that female fertility decreases with age, and is more pronounced after the age of 40. This is influenced not only by the frequency of sexual intercourse, but mainly by physiological and endocrine changes. Cecilia, a senior researcher in the Department of Public Health at the University of Oxford. Papel, an expert in reproduction, warns women that their fertility decreases once they are over 35 years old. Therefore, she advises women to have their first child before the age of 30, so that in case of problems, there is still time and ways to remedy. So when is the best age to have a baby? Our research on obstetrical physiology, eugenics and population control suggests that the most suitable age for women to give birth is 25-29 years old. Clinical practice proves that women at this age have the most vigorous fertility, the best uterine contraction, and less chance of obstructed labor. If the maternal age is too young, such as 20 years old, it is easy to combine gestational hypertension syndrome, preterm labor, etc., and may also lead to obstructed labor because of incomplete pelvic development; if the maternal age is too old, especially over 35 years old, the possibility of oocyte malformation increases, so the incidence of fetal malformation increases. Studies have shown that the incidence of congenital dysmorphic infants is only 1/1500 at the age of 25-29; 1/900 at the age of 30-34; 1/300 at the age of 35-39; and 1/40 at the age of 45 and above. The age of the father also affects fertility. The age of the father also affects fertility For the male partner, the age of childbirth is also related to the health of the baby. Men are generally more energetic and fit at the age of 25-35 and have the highest quality sperm. A survey was conducted on 1,150 children from 302 families, and the statistics showed that the average age of the fathers was 29 years old when the best intellectual and physical strength was born. This is because, with increasing age, there is an increase in chromosomal disorders originating in males. There are statistics that about 1/4 of that extra chromosome 21 in trisomy 21 (congenital stupidity) originates from the father. It has also been shown that neonatal mortality increases with the age of the father. If the father is older than 40 years, the number of children with malformations increases by a factor of 1. In modern society, many of the reasons why men and women hesitate to have children when they reach the right age are because they are afraid that their fledgling careers will be affected. In fact, having a child is not complicated. For women, pregnancy and childbirth is a physiological process, not a disease, and it is perfectly possible to undertake some work that is within their reach. I advise you to cherish your own childbearing age, when there are no health concerns, early to give birth to a child, while running for the future, more for the sake of future generations.