In general, the fetal weight gain in late pregnancy from 37 to 39 weeks is about 1 kg. However, due to the different growth and development of each fetus, there will be individual differences in the value of weight gain. Therefore, pregnant women should pay attention to the changes in their own weight, and if a large weight deviation occurs, the causes should be identified and dealt with symptomatically: 1. Excessive weight gain: commonly seen in pregnant women with excess nutritional supplements, also seen in pregnant women with gestational diabetes. At this time, the fetus is too big, which will increase the difficulty of vaginal delivery. At the same time, the probability of complications after the birth of a pregnant woman is greatly increased. In order to reduce the risk of delivery, it is recommended that pregnant women should have a reasonable diet, control the type of diet and the amount of intake, exercise appropriately, and maintain the normal range of blood glucose by regular maternity checkups. 2. Low weight gain: This is seen in intrauterine fetal growth retardation or the presence of genetic factors. For example, if it is due to nutritional deficiency of the pregnant woman, she needs to make reasonable supplementation of nutrients, plan dietary components, and ensure the adequacy and diversity of nutrition intake; if it is due to insufficient placental function, she needs to seek medical advice and decide whether to terminate the pregnancy under the guidance of the doctor; if it is due to normal physiological genetic factors, the pregnant woman does not need to worry too much; if it is pathological, the pregnant woman needs to seek medical advice and decide whether to terminate the pregnancy. If it is due to normal physiological genetic factors, the pregnant woman does not need to worry too much; if it is due to pathological genetic factors, the pregnant woman needs to go to the hospital for screening and timely treatment of the disease.