Usual care
The weight management in the first trimester includes: (1) learning diet pagoda; (2) recommendations on GWG and exercise; (3) management of exogenous dietary supplements.The weight management in the second trimester includes: (1) instructing pregnant women to evaluate GWG; (2) guiding the pregnant women to discover the questions and communicate with obstetricians; (3) explaining examine time and method of GDM.The weight management in the third trimester includes: (1) instructing the pregnant women to evaluate the nutrition status; (2) instructing pregnant women to evaluate the GWG; (3) guiding the pregnant women to discover the questions and communicate with obstetricians.