The mandatory obstetric checkups mainly include: 1. A systematic examination before 12 weeks of pregnancy, including general physical examination such as height, weight, blood pressure, cardiopulmonary auscultation, etc. Laboratory tests such as blood routine, urine routine, blood type, blood sugar, liver function, kidney function, and eight viral tests. Ultrasonography, including measurement of NT value; 2. Mid-term Down’s syndrome screening, performed between 16 and 18 weeks of pregnancy, again measuring weight and blood pressure; 3. Ultrasound major abnormality examination, performed between 24 and 28 weeks of pregnancy, measuring blood pressure, weight, uterine height and abdominal circumference, etc. The fetal position should be touched during the maternity examination after 28 weeks; 4. Gestational diabetes screening, performed after 24 weeks of pregnancy; 5. Late pregnancy, monthly Ultrasound examination should be performed once a month, while measuring weight, blood pressure, uterine height, abdominal circumference, etc., and fetal heart monitoring should be done regularly after 32 weeks.