Precautions during pregnancy are as follows: 1, avoid exposure to harmful substances: you cannot dye your nails and hair during pregnancy, and those who need to work with harmful substances should take leave during pregnancy, especially in the early 3 months of pregnancy, otherwise they are prone to teratogenicity or miscarriage; 2, avoid ionizing radiation: computers should be noted despite shielding; 3, regular routine: avoid staying up late and eating barbecue; 4, those who have a history of bad pregnancy and delivery should seek medical advice in a timely manner to exclude cervical Avoid miscarriage in the middle of pregnancy; 5, timely maternity checkups, such as 12 weeks of pregnancy to build a card, 20-24 weeks of pregnancy to perform a teratology examination; 6, because of ionizing radiation at high altitude and poor emergency capacity, some airlines also provide that you can not fly after 28 weeks of pregnancy; 7, should not drive, because the abdomen of pregnant women may touch the steering wheel, easily endanger the life of pregnant women and fetuses.