After pregnancy, pregnant mothers need to do many tests, which is often called prenatal checkups, and prenatal is very important. For the first time, pregnant mothers who are newly pregnant will have the question, when to start prenatal checkups? When are prenatal checkups done? What are the items that are checked in each check-up? If a pregnant mother suspects that she is pregnant at home after an early pregnancy test, she should go to the hospital in time. If the pregnant mother has a regular menstrual cycle, she can see the location of the gestational sac in the uterus during this period. If the gestational sac is not visible in the uterine cavity despite regular menstruation, she should be alert to the occurrence of ectopic pregnancy. The number of embryos can also be seen in the 5th to 8th week of pregnancy to determine if there is a possibility of multiple births. Blood tests such as routine blood tests and liver and kidney tests can also be performed during this period, and timely adjustments should be made if abnormalities occur. At 11~13+6 weeks of pregnancy, NT test will be performed to initially screen the development of the baby. At 12 weeks of pregnancy, the baby is basically stable and can be documented in the hospital. In the middle 15-20 weeks of pregnancy, screening for Down’s syndrome is required to assess whether the fetus has congenital intelligence problems. Ultrasound is recommended from 20 to 24 weeks of gestation to rule out fetal surface abnormalities, when the fetus is basically developed and has a lot of space to move, which is convenient for examination. Glucose tolerance test is needed from 24 to 28 weeks of pregnancy, which is to rule out diabetes caused by pregnancy. In addition to the physical examination in the middle of pregnancy, we will also pay attention to the change of fetal position and fetal movement, regular fetal heart monitoring, appropriate follow-up ultrasound, fetal development, placental maturity and amniotic fluid, etc., in order to prepare for the new life and choose the appropriate way to terminate pregnancy.