The most appropriate age for a woman to become pregnant is between 25-29 years old. Choosing the appropriate age for childbirth is beneficial to reproductive health. The age of 25-29 is the most vigorous stage of female reproductive capacity, and planned conception is easy to succeed; if the child is born too early, the female reproductive organs and pelvis are often not fully developed, and the extra burden of pregnancy and childbirth is detrimental to the health of both mother and child, as well as increasing the chances of difficult deliveries and even causing some complications or sequelae; Older than 45 years old also tend to give birth to chromosomally abnormal children, with an increased chance of chromosomal aberrations in the eggs, which can easily lead to miscarriage, stillbirths or abnormal births. In contrast, the optimal age for men to have children is between 23 and 30 years old. During the preparation period, it is recommended to cultivate a healthy lifestyle, such as: 1. regular diet and work and rest; 2. taking 0.4-0.8mg of folic acid daily; 3. quitting smoking and drinking and taking reasonable medication; 4. not to contact pets to avoid toxoplasmosis infection; 5. proper exercise and relaxation.