The hormone level in the body changes after pregnancy, and the resistance of pregnant women decreases. Many things should be noted, especially in the early stages of pregnancy to prohibit strenuous exercise, not to have sex, otherwise it will cause a miscarriage. The most taboo thing during pregnancy is to take drugs, which can directly affect the fetal brain development and central nervous development by acting on the placenta, and in serious cases, fetal malformations can occur. Pregnant women should also stay away from electronic products with radiation, such as computers, cell phones, television, etc., can not be used for a long time, if you can not avoid the purchase of radiation protection clothing, can reduce the impact on the fetus, pregnant women should not use whitening products, many whitening products contain lead and mercury, lead and mercury is teratogenic to the fetus. During pregnancy, you should pay attention to your diet and eat less cold food and stimulating food, otherwise it will stimulate the uterus to miscarriage or premature birth.