Whether weight loss after pregnancy needs to be combined with the specific pregnancy period. For early pregnancy, slight weight loss may be caused by loss of appetite; in the middle and late pregnancy, due to the gradual increase of the fetus in the body, it usually does not lead to weight loss, and the specific reasons for weight loss are as follows: 1. 2, embryonic development abnormalities: after 10 weeks of pregnancy, due to the growth of estrogen in the body slightly slowed down, early pregnancy reaction gradually reduced, after the appetite becomes better weight gradually increased. If the weight does not rise in the middle of pregnancy but falls, you should suspect whether it is caused by embryonic dysplasia, which may lead to growth restriction and thus overall weight loss, at this time, you can consult the obstetrics department for amniocentesis or fetal ultrasound to actively find out whether there is abnormal embryonic development; 3, gestational diabetes: if pregnant women suffer from gestational diabetes, symptoms such as excessive drinking, overeating, polyuria, weight loss, etc., you should ensure a diabetic diet and regular monitoring. At this time should ensure diabetic diet, regular monitoring of blood glucose, to maintain a rich and adequate nutrition; 4, amniotic fluid reduction: late pregnancy, if pregnant women have weight loss, may be related to the decrease in the amount of amniotic fluid in the abdomen, at this time can be under the guidance of doctors to take appropriate drugs or drink more water to maintain the amount of amniotic fluid to ensure normal fetal growth and development.