Unlike animals, animals often use spring and autumn as the best seasons to reproduce. Humans have no obvious “seasonality” in this regard, and can have sexual activity 365 days a year, except for special circumstances, and can get pregnant. The ideal time to have a child is when all the conditions required are optimal. This is of great benefit both to the parents and to the child. From the point of view of eugenics and optimal breeding, it is very possible to choose the right season of birth to minimize the temperature changes, disease epidemics and other unfavorable factors to ensure maximum favorable factors for the growth and development of the fetus. Considering the living and geographical conditions in most areas of the province, it is ideal to get pregnant between August and September. From the medical point of view, there are three critical periods of embryonic development: the first is the brain formation period, i.e. the third month of conception; the second is the brain cell division period, after the sixth month of conception; and the third is the nerve cell development coordination period, the seventh to ninth month of conception. If you choose to conceive between August and September, the third and sixth months of pregnancy and the delivery period are in the late autumn and mid-spring seasons when the climate is suitable and nutrition can be easily deployed, so the fetal nervous system can be well developed. According to some data, the peak season of childbirth is from July to December every year, and the off-season is from April to June, which is closely related to people’s choice of wedding date. Influenced by the traditional concept, many people arrange to get married on New Year’s Day, Spring Festival and National Day, and get pregnant immediately after the wedding. This is when the first warmth or late autumn and early winter, temperature changes, is the season of viral diseases, in pregnancy, especially in early pregnancy, viral infections can easily lead to fetal malformations. For example, if the mother suffers from rubella in the early and middle stages of pregnancy, the virus can enter the fetus through the placenta and multiply, causing damage to the eyes, ears, brain, heart and nervous system (medically known as congenital rubella syndrome); influenza virus can lead to central nervous system malformations and lesions such as anencephaly and hydrocephalus in the fetus, as well as cleft lip and palate and congenital heart disease; if the pregnant woman is accompanied by fever, she is also prone to premature birth or miscarriage. Medical experts believe that the best season for pregnancy is around August, about two months from late July to early September, and this is justified. Let’s look specifically at what are the benefits of getting pregnant during this season? In the first 40-60 days of pregnancy, in September or October, most pregnant women have poor appetite and are picky eaters, but at this time there are many varieties of vegetables and fruits, which can regulate the appetite and protect the nutritional needs of the fetus. 2-3 months later, in late autumn, the climate is cool and the appetite of pregnant women is increasing, which is very beneficial to the growth and development of the fetus. At this time, the sunshine is sufficient, pregnant women often sunbathe, the body can produce a lot of vitamin D, promote calcium, phosphorus absorption, help the fetal bone growth. And August to September between the summer and autumn, pregnant women sleep at night by the heat of the 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 warm early spring come with influenza, rubella, flu and other viruses, the fetus is more than 3 months old and has safely passed the teratogenic sensitive period. Moreover, the corresponding due date is around May of the following year. The time of delivery is the end of spring and the beginning of summer, the temperature is suitable, the mother breastfeeding, baby bathing are not easy to catch cold, vegetables, fish, eggs and other side food supply is also very rich, maternal appetite is good, milk is also rich in nutrition, should be the best season of “sitting in the moon”. While ensuring the quality of breast milk, the newborn baby is lightly dressed, with little clothing, which facilitates the free movement of limbs and is beneficial to the development of the brain and the whole body. After the child’s first month, the season is already summer, with shady trees, fresh air and plenty of sunshine, making it easy to take outdoor sunbathing and air baths. When the child is half a year old, he or she will be in the golden autumn month of October, and when it is time to increase complementary foods, he or she will have successfully avoided the summer season of pediatric enteritis and other intestinal diseases. When the child learns to walk and begins to wean, it is the turn of spring and summer, when the climate is mild and fresh food is plentiful, providing favorable conditions for the child’s growth and development. Moreover, during spring and summer, the stomach and intestines can easily adapt and weaning is easy to succeed. It is important to avoid pregnancy in May-June because the hot and humid weather in July makes the appetite not strong and the pregnancy reaction makes the nutritional intake insufficient, which easily affects the development of the fetus. It is also important to avoid pregnancy in October and delivery in the height of summer in July. The maternal sweat is already much, if the delivery in the summer heat, the climate is hot and humid, it is easy to occur heat stroke, the light dizziness, chest tightness, body temperature rise; serious fever, coma, and even death. At this time, it is also the season of skin infections, diarrhea and other diseases, so it is best to avoid giving birth in high summer. Winter is not suitable for conception, because the lack of fresh vegetables and fruits in winter makes the intake of trace elements and vitamins relatively low, which can easily affect the growth and development of the fetus. In addition, the climate in the north is very cold in winter, and there are more chances of viral infections. As we all know, the early pregnancy period is the embryonic stage within 8 weeks, during this period, if the pregnant woman is infected by the virus, it will directly affect the fetus, resulting in fetal mental retardation or malformation. In addition, in winter, there are relatively few opportunities to go out, doors and windows are closed, indoor air is not fresh, such as indoor heating stove, the air is high in carbon dioxide, so that the first pregnancy of the fetus teratogenic rate increases, thus increasing the birth of defective children. Therefore, married couples should avoid conceiving in the cold winter. The month of January is the third or ninth day of winter, when it is also not suitable for childbirth. When the mother is breastfeeding, bathing or dressing the baby, if there are no good conditions to prevent cold and warmth, it is easy to catch a cold. Newborns are also less adaptable to the cold, and diseases such as upper respiratory infections and pneumonia may follow. Therefore, it is not advisable to get pregnant in January. Of course, everyone has their own ideas and practical situations, as long as attention is paid to choosing the best time to have children, it is not necessary to follow the above recommendations, nature may be the best choice.