The contents of perinatal care are as follows: 1. 7-8 weeks of gestation: ultrasound, routine blood, urine, liver and kidney function, thyroid function, infectious series, etc., to understand the location of the gestational sac and the basic condition of the pregnant woman, and to reduce the occurrence of miscarriage and preterm delivery; 2. 15-20 weeks of gestation: Down’s syndrome screening to predict the risk of Down’s syndrome; 3. 20-24 weeks of gestation: ultrasound examination, i.e. 3-D and 4-D 3. 20-24 weeks of gestation: ultrasound examination, i.e. 3D and 4D ultrasound examination, to exclude fetal organ development malformation; 4. 24-28 weeks of gestation: glucose tolerance screening, to exclude gestational diabetes; 5. late gestation: ultrasound examination and fetal heart monitoring, to understand the intrauterine growth and development of the fetus.