If you don’t gain weight in early pregnancy is normal, if you don’t gain weight in late pregnancy is not normal. In early pregnancy, pregnancy sickness will be more serious, at this time the pregnant woman is not able to eat normally, or even completely unable to eat, so it will cause weight loss instead of weight gain. If you don’t gain weight in late pregnancy, it may be caused by malnutrition or poor fetal development, etc. Therefore, not gaining weight in late pregnancy needs to be determined according to the situation. During pregnancy, you should maintain a good lifestyle, pay attention to keeping a light diet, and eat more food high in protein and vitamins, so as to replenish the nutrition of the organism. During pregnancy, coitus should be prohibited and cleanliness and hygiene should be observed. Throughout the pregnancy weight should increase about 12.5kg, it is recommended that pregnant women should be regular physical examination, pregnancy does not grow weight may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.