It is not normal to have no weight gain in the 5th month of pregnancy, but it is normal to have no significant weight gain in the first 3 months of pregnancy, or even to have a light weight. After the third month of pregnancy, the pregnancy reaction disappears, the appetite increases, and the fetus grows significantly, then the weight should be increased, and the weight should be increased by about 20-30 pounds during the whole pregnancy. If the weight is not increased at 5 months, you should pay attention to strengthen the nutrition and increase the diet in an appropriate amount in order to promote the growth and development of the fetus and to be able to achieve the nutrients needed for the growth of the fetus. Dynamic observation of fetal development through ultrasound examination, including indicators such as biparietal diameter, head circumference and femur length. As long as there is no intrauterine growth restriction of the fetus, pregnant women should not be nervous, but should not overeat and overeat, and should have balanced nutrition and diversified diet with appropriate increase in quality protein.