There are 4 weeks in each month, and 5 months of pregnancy is 20 weeks. The pregnancy period is calculated from the first day of the last menstruation, the first day is 0 weeks + 1 day, the 8th day is 1 week + 1 day, and so on, the whole pregnancy period is 40 weeks in total, 5 months of pregnancy belongs to the middle stage of pregnancy. In the 5th month of pregnancy, the height of the uterus is about 1 finger below the navel, the pregnant woman can see a mild bulge in the lower abdomen when standing, the pregnancy vomiting has basically disappeared, and most pregnant women have felt the fetal movement. The fetus has basically developed, reaching a length of about 25cm and a weight of about 320g. The fetus has started to grow fat and hair, and the fetus has developed the function of swallowing and urination. From the 5th month of pregnancy, the fetus grows faster and many organs are gradually improving their functions. Most pregnant women start to eat substantially more in the 6th month of pregnancy, plus the pregnancy vomiting basically disappears, the body has adapted to the state of pregnancy, the mood is more relaxed, and the weight increases rapidly. At this time, we should pay attention to control the rate of weight gain, so as to avoid obstructed labor due to excessive weight or fetal size at the time of delivery.