No change in weight throughout pregnancy is generally not normal, and the average weight gain during normal pregnancy is about 12.5kg. However, if the weight does not increase in early pregnancy and the labor test is normal, then it may be caused by the following reasons: 1. Early pregnancy reaction: when the pregnancy vomiting is serious, then the pregnant woman’s appetite will decrease, then it is easy to lead to weight not gain. 2. Fetal absorption: If the fetus absorbs the nutrients of the pregnant woman quickly, then it will also lead to the weight of the pregnant woman does not increase. 3. Pregnant women eat less: If the pregnant woman has a small appetite and usually takes in less food, then she may not gain weight in the early stages of pregnancy. Women in pregnancy should pay attention to regular obstetric examination, eat more vegetables and fruits, maintain a healthy lifestyle, the whole pregnancy does not grow weight may have other reasons, it is recommended to timely hospitalization to clarify the cause of the disease, to avoid delay.