During the period from pregnancy to delivery, the pregnant woman has about 9-12 prenatal checkups. The first check-up is called the initial check-up, which is mainly to check the physical condition of the pregnant woman and whether the pregnancy is normal. There are many items in the first check-up, including blood and urine tests, infectious disease screening, liver and kidney function, electrocardiogram, cardiac ultrasound, liver, gallbladder, pancreas and spleen ultrasound, etc. Abdominal or vaginal ultrasound and blood HCG test are also needed to rule out ectopic pregnancy. In the next 28 weeks, the pregnant woman will have a general checkup once a month, including routine blood and urine tests, uterine height, abdominal circumference measurement and fetal heart auscultation, etc. The NT test will be done at 11-13 weeks to check the thickness of the nuchal translucency layer, the Down’s syndrome screening at 16-19 weeks, and the fetal macroscopic screening at 22-24 weeks to make sure that there are no abnormalities in fetal system development and chromosomal abnormalities. If the result of Down’s screening is unsatisfactory, non-invasive DNA test or prenatal amniocentesis is needed. 28-37 weeks, pregnant women should have a biweekly maternity checkup, which includes general examination to monitor fetal growth and development and maternal condition. 37 weeks later, pregnant women should have weekly blood and urine tests, ultrasound, fetal heart monitoring, etc., mainly to determine fetal weight, amniotic fluid and fetal position, etc., as well as a The mother should undergo screening for infectious diseases and GBS examination of vaginal secretions to decide whether to choose normal delivery or cesarean delivery.