In the second trimester, the uterus is still in the pelvic cavity and is positioned below the upper border of the pubic symphysis, so it usually does not show pregnancy. After the third month of pregnancy, the bottom of the uterus protrudes from the upper edge of the pubic symphysis, and the belly will begin to show pregnancy. If the belly is obvious in the second month of pregnancy, it is common in the following cases: 1, multiple pregnancy: if the pregnant woman is pregnant with twins, triplets, etc., it is possible to make the uterus significantly larger, resulting in the second month of pregnancy; 2, too much intake: eating too much is easy to appear abdominal bulge, generally women will strengthen nutrition after pregnancy, exercise less, excess nutrition and fat accumulation is easy to appear fat body shape. It is recommended to control weight during pregnancy, generally weight gain of no more than 25 pounds; 3, other: for example, pregnancy combined with uterine fibroids, if the uterine fibroids are relatively large, may lead to early belly show pregnant time, can be ruled out by ultrasound examination. Pregnant women do prenatal screening and regular maternity checkups during pregnancy can detect abnormalities in the pregnancy and fetus early. This will also help the pregnant woman to stabilize her mind and go through the pregnancy period healthily.