Epidemiology has proved that women infected with the virus before and after pregnancy, not only the disease itself, but also the fetus can be deformed and infected with congenital diseases. Therefore, attention should be paid to the following common virus infections. Rubella: Pregnant women in the 3 months before pregnancy to the first 2 months of pregnancy infection of this disease, often lead to egg distortion; If the infection within 8 weeks of pregnancy can lead to congenital heart disease and microcephaly in the fetus, so the pregnancy should be terminated after the serological examination is confirmed in the early pregnancy. Influenza: Pregnant women suffer from influenza, which can cause the fetus to have cleft lip, hydrocephalus, abortion and so on. Hepatitis B: After pregnant women suffer from hepatitis B, it can be transmitted to the fetus through the placenta, resulting in acute hepatitis in infants, such as long-term virus can develop into chronic hepatitis. Therefore, women with hepatitis B, or in the chronic hepatitis active period, are not suitable for pregnancy. Chickenpox: After pregnant women are infected with chickenpox, the virus can be transmitted to the fetus through the placenta, damaging the fetal motor nerves, causing congenital cataracts, muscle atrophy and so on. Termination of pregnancy if infection occurs in the first trimester. Toxoplasmosis: It is an infectious disease caused by the entry of toxoplasmosis into the body. Among animals, cats are the most susceptible to the disease, and people can be infected by close contact with cats. After pregnancy, toxoplasmosis can enter the fetus through the placenta, and after fetal infection, most of them will cause abortion, stillbirth or premature birth. Even at birth, retinoiditis is prone to occur, causing blindness and mental retardation.