1. The time of the first prenatal examination is usually at 12-14 weeks of gestation (in the last two years it is catching up with the peak period of childbirth, and the first obstetrics visit is usually before 6-7 weeks of pregnancy). First visit to establish a pregnancy health care booklet, assessment of high-risk factors during pregnancy. Physical examination: including measurement of blood pressure and weight, fetal heart rate determination.

2. Typically, at least about 10 labor and delivery visits throughout the pregnancy, every 4 weeks until 28 weeks of gestation, every 2 weeks from 28 - 36 weeks of gestation, and weekly after 36 weeks of gestation. Those with IVF twin pregnancies, or those with high-risk factors, such as pregnancy complications, blood sugar abnormalities, and ultrasound test abnormalities, need to increase the number of maternity checkups as appropriate.