Early pregnancy is the period when the organs of the whole body are developed and formed, and this period forms the original base of all human organs. And the 3rd-8th week is the sensitive period of embryonic development, which is most susceptible to teratogenic factors, and most of human congenital malformations occur in this period. Therefore, the health care in early pregnancy is very important. 1. Pregnant women and their families often ask whether smoking and alcohol are really harmful to fetal development. Smoking is one of the most harmful factors to the health of the fetus, it can make the fetus lack of oxygen and affect the development of the brain, the mother smokes, her fetus will be premature or born with low weight, and smoking also increases the chances of miscarriage, stillbirth, placental damage and malformation, so it is necessary to quit smoking. Even passive smoking can damage the fetus and is even a cause of infant mortality, so it is best for the husband to quit smoking during his wife’s pregnancy. If you are in a smoking environment, try to go to a smoke-free area. Alcohol affects the quality of sperm and eggs before conception, and after conception it affects then affects embryonic development, which can lead to fetal mental retardation, slow growth and neurological damage also, which can cause stillbirth, so it is best not to drink alcohol during pregnancy. 2, away from radiation and toxic substances. In the 3 to 10 weeks of pregnancy, pregnant women exposed to X-rays can directly affect the fetal central nervous system and eye development, the occurrence of cerebellar malformations and congenital cataracts, small eyes, etc., so be sure to avoid the radiation environment, away from ionizing radiation. And in the office equipment emitting ultraviolet and infrared radiation is acceptable, such as laser printers, copiers, computer display terminals, etc. Avoid contact with toxic and harmful substances. Such as cleaning agents, binders, volatile paints, varnishes, solvents, certain glues, etc., to avoid potential harm. 3.Avoid infection. Due to the reduced resistance during pregnancy, pregnant women are prone to colds. In the early stage, due to the imperfect development of various organs of the fetus, viruses extremely toxins can affect the development of fetal organs through the placenta, making the fetus more likely to suffer from precordial disease and harelip. Influenza with high fever is likely to cause fetal neurological developmental disorders, so you should avoid influenza during this period and go to public places less often to strengthen the body’s resistance. Moderate physical exercise and maintaining a positive mental state help to strengthen the immune system. Drink more water and pay attention to rest.