Every mother-to-be wants her baby to be healthy, so they often buy a lot of books to learn about post-pregnancy health care and fetal education. The quality of the fertilized egg fundamentally determines the health of the fetus, and mastering the timing of conception is actually more important than post-pregnancy health care and fetal education. Some women have asked if it is really bad to get pregnant in winter. In fact, each season has different climatic characteristics, and winter is characterized by cold and dry. This weather causes a series of changes that can also have an impact on conception. So, in this weather condition, what should be considered by the unexpecting parents before conception if they want to conceive a smart and lovely baby? I. Miscarriage The research on environmental pollution affecting fertility function is not yet perfect, but factors such as toxic substances in the air and smoking may have a negative impact on human fertility. Pregnant women should start to protect themselves well in advance in the first trimester of pregnancy. According to relevant studies, it was found that in Tianjin area, there are more cases of embryonic stoppage during the winter heating period. Some women who have had spontaneous miscarriage or embryonic development termination and have not yet found the specific cause should not choose to get pregnant in winter, but can choose to conceive in summer or autumn during the non-heating period. Reminder: 9 measures to reduce the occurrence of miscarriage Identify the causes of habitual miscarriage, according to the causes to prevent and treat in order to effectively control its occurrence: 1, within six months after the occurrence of miscarriage to contraception, to wait for six months after the pregnancy again, can reduce the occurrence of miscarriage. 2.Genetic examination should be done, and both spouses should receive chromosome examination at the same time. 3.Do blood group identification including Rh blood group system. 4.Inside stitching can be done for those with loose endometrium. 5, for luteal insufficiency treatment of drugs to be used for a period longer than the duration of pregnancy of the last miscarriage (if the last miscarriage was in the third trimester, the treatment time cannot be shorter than the third trimester). 6, have low thyroid function, to maintain normal thyroid function before pregnancy, and also to take anti-low thyroid drugs during pregnancy. 7, pay attention to rest, avoid intercourse (especially during the pregnancy period of the last miscarriage), emotional stability, regular and disciplined life. 8, the male partner should do the examination of the reproductive system. Those with bacteriospermia should be treated thoroughly before conceiving the wife. 9. Avoid exposure to toxic substances and radioactive substances. Second, air pollution 1, indoor air pollution winter vacations, happy events, pregnancy, but because of the cold weather, people as far as possible to reduce outdoor activities, most of the time is spent in the house with heaters or stoves. If the doors and windows are closed and the air is not changed in time, plus the carbon monoxide gas emitted from the stove, it will make the indoor air dirty, which will not only make the pregnant woman feel unwell, but also have a negative impact on the growth and development of the fetus, especially on the central nervous system. Therefore, the mother in the winter both to prevent carbon monoxide poisoning, but also in the afternoon when the weather is warm to do some suitable activities outdoors, more whistling some fresh air, in order to facilitate the development of the fetus. In the first trimester of pregnancy, it is the fetus heart, brain, liver, kidneys and other important organs differentiation and formation of the critical period, if the early pregnancy in winter, especially in the winter in the north, indoor air circulation, indoor air pollution is serious, pregnant women go out less time, so the early pregnancy is affected by air pollution is greater, the relative risk of fetal defects is significantly higher than in other seasons. 2, outdoor air pollution Sulfur dioxide in the air can make the genetic genes and chromosomes in human cells abnormal, resulting in fetal malformations. If conception occurs in winter, it is immediately followed by spring. The high humidity in the air and the gradual increase in temperature are conducive to the reproduction and growth of various types of viruses, causing a significant increase in viral diseases and often causing epidemics. In addition, the weather in spring is changeable and easy to get cold, so the chance of virus infection for pregnant women increases. Reminder: how to avoid winter air pollution 1, keep indoor air circulation, timely replenishment of fresh air. 2, when the weather is warm in the afternoon to go outdoors more suitable exercise, whistle fresh air. Of course, to choose the location of activities with less air pollution. Third, the flu pregnant women are more worried about the flu than the impact of the disease and treatment on the fetus. As we have already mentioned, the common cold is mostly caused by rhinovirus, syncytial virus, influenza virus, adenovirus, parainfluenza virus and enterovirus. Generally speaking, the common cold rarely causes fetal malformations, but influenza and influenza viruses have certain teratogenic effects. And even more frightening, the results of a newer study suggest that mothers-to-be who get the flu in the first trimester may damage the fetal brain and increase the risk of their children developing schizophrenia in the future. Researchers studied a sample of 64 families and found that if a pregnant woman had the flu in the first trimester of pregnancy, she was seven times more likely to give birth to an adult offspring with a severe mental disorder than other children.