Family planning, as the name suggests, is the planned birth of a child. The State treats family planning as a hundred-year plan to have a macro control of the total population, and the planned birth of a child in each family is also an important task for the family. It is ideal to choose the time to have a child when all the necessary conditions are in the best condition, which is beneficial to both the parents and the child. The choice of the best time for the birth of a child should be considered in terms of being able to promote physical and intellectual development. So how to choose the best time to get pregnant? From the perspective of eugenics and euthanasia, it is feasible to choose the right season of birth to minimize unfavorable factors such as temperature changes and disease epidemics, so as to ensure that favorable factors conducive to the growth and development of the fetus are maximized. Considering the living and geographic conditions in most areas of the province, pregnancy between August and September is ideal. From a medical point of view, there are three key periods of embryonic development: the first is the brain formation period, that is, the third month of conception; the second is the brain cell division period, after the sixth month of conception; the third is the development of nerve cells to coordinate the period of conception of the seventh to ninth months. If you choose to conceive between August and September, the third and sixth months of pregnancy and delivery are in the late fall and mid-spring seasons when the climate is suitable and nutrition is easy to deploy, so the fetal nervous system can be well developed. Some data show that July to December each year for the peak season of labor and delivery, April to June for the off-season, which is closely related to the choice of people’s wedding date. Influenced by traditional concepts, many people arrange to get married on New Year’s Day, Chinese New Year and National Day, and then get pregnant immediately after marriage. At this time when the first warmth or the end of autumn and early winter, the temperature changes, is the season of viral diseases, in pregnancy, especially early pregnancy, viral infections can easily lead to fetal malformation. For example, the mother suffered from rubella in early pregnancy, mid-pregnancy, the virus can pass through the placenta into the fetal body and reproduction, causing damage to the eyes, ears, brain, heart and nervous system (medically referred to as congenital rubella syndrome); Influenza virus can lead to fetal anencephaly, hydrocephalus and other malformations of the central nervous system and pathology, as well as lip, palate clefts and congenital heart disease, etc.; If the pregnant woman is accompanied by a fever, but also susceptible to preterm labor or miscarriage. Reproductive experts believe that the best season to get pregnant is around August, about two months from late July to early September. In the early stages of pregnancy 40 ~ 60 days when the pregnancy reaction occurs, just in September or October, most pregnant women have a poor appetite, love to picky eaters, but at this time there are many varieties of vegetables, fruits and melons, can be adjusted to enhance appetite, to protect the nutritional needs of the fetus. 2 ~ 3 months after the late autumn, the climate is cool, pregnant women’s appetite gradually increased, the growth and development of the fetus is very favorable. At this time the sunshine is sufficient, pregnant women often sunbathing, the body can produce a lot of vitamin D, promote calcium and phosphorus absorption, help fetal bone growth. And between August and September is between summer and autumn, pregnant women sleep at night by the impact of summer heat is small, pregnant women’s rest, nutrition and intake of various vitamins are more adequate, are conducive to the development of the fetal brain and the intellectual development after birth. When the snowy winter and the first warm spring come with influenza, rubella, meningitis and other viruses, the fetus is already more than 3 months old, and has safely passed the sensitive period of teratogenicity. Moreover, the corresponding due date is around May of the following year. At the time of delivery, it is the end of spring and the beginning of summer, the temperature is suitable, it is not easy for mothers to breastfeed and babies to catch cold in the bath, and the supply of vegetables, fish, eggs and other foodstuffs is also very rich, the mother’s appetite is good, and the breast milk is rich in nutrients, so it should be the best season for “sitting in the moonlight”. Ensure the quality of breast milk at the same time, the newborn baby light clothing, clothing is very little, easy to move freely in all four limbs, is conducive to the development of the brain and the whole body. After the child is a month old, the season is already summer, green trees, fresh air, sunshine, easy to outdoor sunbathing and air bathing. Children half a year before and after the fall in October, the increase in complementary feeding and has successfully avoided the summer season of pediatric enteritis and other intestinal diseases. By the time the child learns to walk, began to wean the age of one year, is again the turn of spring and summer, the climate is mild, plenty of fresh food, for the child’s growth and development to provide favorable conditions. Moreover, at the turn of spring and summer, the stomach and intestines are easy to adapt to, and weaning is easy to succeed. Be careful to avoid pregnancy in May-June, because the weather is hot and humid in July, the appetite is not strong, coupled with the reaction of pregnancy, making the nutritional intake is insufficient, which will easily affect the development of the fetus. It is also important to avoid pregnancy in October and delivery in the height of summer in July. Maternity mattress sweat would have been more, if the delivery in the summer heat, the climate is hot and humid, it is easy to heatstroke, light dizziness, chest tightness, body temperature rise; heavy fever, coma, or even death. At this time, is also a skin infection, diarrhea and other diseases of the season, so it is best to avoid delivery in the summer. Winter is not suitable for conception, because winter fresh vegetables and fruits are more lack of, so that the opportunity of trace elements is more. We all know that the early pregnancy within 8 weeks for the embryonic period, this period of pregnant women, such as viral infections, will directly affect the fetus, resulting in fetal mental retardation or malformation. In addition, in winter, there are relatively fewer opportunities for outdoor activities, doors and windows are closed, indoor air is not fresh, and if a stove is built indoors for heating, the carbon dioxide content in the air is higher, which increases the rate of teratogenicity of the fetus in the first trimester of pregnancy, and thus increases the birth of defective children. Therefore, married couples should avoid conceiving in the cold winter. January is the month of March 9 or April 9 days, the right time for cold winter, this time is also not suitable for childbirth. Mothers in breastfeeding, bathing or dressing the baby, if there is no good conditions to protect against the cold and keep warm, it is easy to catch a cold and flu. Newborns are also less adaptable to the cold, and diseases such as upper respiratory tract infections and pneumonia may follow. So it is not advisable to get pregnant in January. Of course, everyone has their own ideas and practical situation, as long as attention is paid to choosing the best time to have children, not necessarily have to follow the above suggestions, natural pregnancy may be the best choice.