There are two types of hyperglycemia during pregnancy, one is pre-pregnancy diabetes and the other is gestational diabetes. In the case of gestational diabetes, blood sugar can drop to normal after the birth of a child, and pregnant women who use insulin can stop using insulin. For gestational diabetes mellitus, the type of diabetes and the status of glucose metabolism should be reassessed in the postpartum period, and usually a 75g oral glucose tolerance test should be performed again 4-12 weeks postpartum to assess the status of glucose metabolism, and the 75g oral glucose tolerance test should be performed again one year postpartum to assess the status of glucose metabolism. The 75g oral glucose tolerance test is performed again at one year postpartum to evaluate the status of glucose metabolism.