Three months pregnant, the uterus is mainly located in the pelvic cavity, through the abdomen is difficult to see the bulging uterus, so pregnant women’s abdominal bulging is not obvious, generally does not appear to be obvious abdominal enlargement. If the increase is more obvious, may be the following reasons: 1, twin or multiple pregnancies: the uterus is larger caused by the abdomen is more obvious; 2, pregnant women’s body type: the body type of fat people than the body type of thin people abdomen is more obvious; 3, over-nutrition: resulting in a larger fetus, the abdomen is more obvious; 4, gestational diabetes: such as poor blood glucose control can easily lead to a huge child, the abdomen is also more obvious. During pregnancy, pregnant women need to supplement vegetables and fruits with high vitamin content to promote fetal growth and development. At the same time, regular obstetric examination to observe fetal growth and development.