The number of maternity checkups during pregnancy needs to be determined according to the actual situation of the pregnant woman, generally once every 4 weeks in early pregnancy, and high-risk pregnant women need to increase the number of maternity checkups as appropriate. The number of maternity check-ups is also related to the week of pregnancy, as follows: 1. Early and middle pregnancy: before 27 weeks of pregnancy, the first prenatal check-up starts when the pregnancy is confirmed, and then every 4 weeks. Pregnant women need to establish a pregnancy health handbook in the hospital. The maternity checkup is mainly to test some routine items to ensure the status of the body. For example, routine blood, urine, blood type, liver and kidney function, hepatitis B, syphilis, AIDS and other items, but also includes electrocardiogram, ultrasound, Down’s syndrome screening, nuchal translucency layer, amniocentesis, etc., to determine the development of the fetus, determine whether it is intrauterine pregnancy, check whether the gestational age and gestational period match; 2, late pregnancy: every 2 weeks from 28 to 37 weeks of pregnancy maternity check, mainly to check the height of the uterine fundus, fetal heart rate, fetal position and other abnormalities 2.Late pregnancy After 37 weeks of pregnancy, the number of check-ups should be increased according to the situation of pregnant women who have diabetes, hypertension or heart disease.