High blood sugar in pregnancy does not necessarily get better after giving birth. Gestational diabetes is diabetes diagnosed after an oral glucose tolerance test at 24-28 weeks of pregnancy. The treatment of gestational diabetes is mainly based on adherence to a diabetic diet and exercise, and insulin therapy is needed when diet and exercise therapy do not bring blood sugar up to standard. Some patients with gestational diabetes are able to recover their blood glucose after delivery, and some are not able to return to normal. Roughly divided into the following situations: 1, return to normal, about 1/3 of gestational diabetes patients after delivery of blood glucose can return to normal. 2, some gestational diabetes patients after delivery can not return to normal, continue to maintain the state of diabetes. 3, there are also some patients after delivery of blood glucose decreased, but can not be reduced to a completely normal state, glucose tolerance abnormalities and other impaired glucose regulation process. Therefore, patients with gestational diabetes should have their diagnosis and treatment of diabetes reassessed by a physician 42 days after delivery.