It is normal to gain about 2 kg in the 4th month of pregnancy. In the fourth month of pregnancy, that is, in the middle of pregnancy, after the fetus has developed and the woman’s early pregnancy reaction has disappeared, her appetite will improve and she will start to gain weight. The degree of weight gain is mainly related to the amount of food a woman eats and digestion and absorption, and women with good appetite will gain more weight accordingly. However, women should not gain too much weight in the middle of pregnancy, as this may increase the occurrence of pregnancy complications, such as gestational diabetes. In early pregnancy, most women experience gastrointestinal discomfort such as nausea, vomiting and acid reflux, so it is normal for their weight to remain at the same level or to drop slightly, as long as the food can meet the needs of the pregnant woman and the fetus in early pregnancy.