A pregnancy lasts one month every 4 weeks for a total of about 10 months (40 weeks). Post-pregnancy gestation period is counted from the first day of the last menstrual period and every 4 weeks is one month, totaling about 10 months (40 weeks, about 280 days). In clinical work the whole pregnancy is divided into 3 periods, i.e. early pregnancy (<14 weeks of gestation), midterm pregnancy (low 14 to 27+6 weeks of gestation) and late pregnancy (low 28 weeks of gestation and beyond). It is important to check the match of gestational weeks during early pregnancy based on the size of the buds or the length of the head and buttocks, and to keep up with the labor and delivery checkups. As the weeks of pregnancy increase, the diet should be increased to meet the needs of fetal growth and development in the middle trimester. From late pregnancy onwards, you should follow the doctor's instructions to conduct fetal movement counting to self-assess the intrauterine status of the fetus, and go to the hospital in time when there is a decrease in fetal movement and other abnormalities.