I do not know when, the city “late childbearing” group is growing, many people have passed the 30-year-old childbearing age “cordon sanitaire”, especially women, because of the pressure, busy work, many women are prone to miss the birth of the “golden period”. The “golden period”. With age, all parts of the human body are aging and degeneration, ovarian function is also gradually degraded, it is easy to lead to chromosomal abnormalities in the eggs, the older the eggs are affected by the environment and pollution, the more, these are the factors that lead to infertility. Unhealthy lifestyle habits can also accelerate the aging of the eggs. Many women smoke and drink for career and socializing purposes, but these harmful substances will accelerate the decline of female reproductive function and have an impact on fertility. What is the optimal age for women to have children? According to the research on obstetric physiology, eugenics and population control, the optimal age for women to have children is 25-29 years old. From the physiological point of view, around 25 years old is the best age for women to give birth, when the cervical canal is elastic and easy to dilate, and the uterine muscle contraction has enough strength, so it is easy to give birth safely. Higher age increases the risk of fetal malformations and premature death. 30-34 year old women have a 20% higher risk of preterm labor. Studies have shown that the incidence of Down syndrome babies is only 1 in 1500 for those who give birth between the ages of 25-29; 1 in 900 for those aged 30-34; rising to 1 in 300 for those aged 35-39; and as high as 1 in 40 for those aged 45 and above. For the male partner, the age at which the child is born is also related to the health of the baby The age of fertility is also related to the health of the baby. Generally speaking, men at the age of 25-35 are energetic and healthy, with the highest sperm quality. Now that the family planning policy has been liberalized, many people will consider having a second child. If you have a normal normal delivery, if you are breastfeeding your baby, it is best to get pregnant after your baby is weaned, so that your body recovers better and is conducive to the growth and development of the fetus after pregnancy. If you don’t breastfeed your baby after a normal delivery, you can usually get pregnant for the second time in about six months, but don’t get pregnant too soon after delivery, or your body will not be conducive to the growth and development of the fetus. Of course, the best age to have a baby is 24-29 years old, so the best age to have a second baby should not be more than 35 years old. Generally two to three years after giving birth to the first child is the best interval. By this time the body has returned to normal and the older child is ready to let go.