Whether or not weight loss occurs after pregnancy needs to be combined with the specific pregnancy period. For early pregnancy, may be due to loss of appetite caused by slight weight loss, to the mid-pregnancy and late pregnancy, due to the body of the fetus gradually increased, usually does not lead to weight loss, the specific causes of weight loss, as follows: 1, digestive symptoms: early pregnancy due to the increase in oestrogen, resulting in gastrointestinal tract reaction, caused by loss of appetite, nausea, vomiting and so on, may be a slight loss of body weight, is a normal phenomenon! There is no need to worry too much; 2, abnormal embryonic development: after 10 weeks of pregnancy, due to the estrogen growth in the body slows down a little, early pregnancy reaction gradually reduce, appetite becomes better after the gradual increase in weight. If the mid-pregnancy weight does not rise but fall, should be suspected of whether caused by poor embryonic development, may lead to growth and development restrictions, thus the overall weight loss, at this time you can consult the obstetrics department for amniocentesis or fetal ultrasound, and actively find out whether there is an abnormal development of the embryo; 3, gestational diabetes: if pregnant women suffering from gestational diabetes, appearing to drink too much, too much to eat, too much to urinate, weight loss and other symptoms, at this time should ensure that diabetic diet and regular monitoring of diabetes. At this time should ensure that the diabetic diet, regular monitoring of blood glucose, to maintain rich and adequate nutrition; 4, amniotic fluid reduction: late in pregnancy, if the pregnant woman weight loss, may be related to the decrease in the amount of amniotic fluid in the abdomen, at this time under the guidance of the doctor to take appropriate medication or more water to maintain the amount of amniotic fluid, to ensure that the normal growth and development of the fetus.