The weight gain varies depending on the individual’s body type, and is usually about 5 pounds in the fourth month of pregnancy. After pregnancy, as the fetus gradually grows, the weight also increases. During the developmental stage of the fetus, if the pregnant woman has a large amount of food or the fetus absorbs it better, etc., the weight will increase rapidly. The fourth month of pregnancy belongs to the mid-pregnancy stage, when the fetus is not growing very much and the amount of weight gain is not very obvious. The amount of weight gained will vary depending on the individual’s physical condition. Therefore, in general, the weight gain in the fourth month of pregnancy is about 5 pounds. It is recommended to plan the diet structure reasonably during pregnancy, do not overeat, and consume some fruits to supplement vitamins appropriately. Pay attention to hygiene, don’t have pressure, relax your mind, pay attention to rest, and have regular maternity checkups. If you feel unwell, you should go to the hospital immediately.