The size of a pregnant woman’s belly in the sixth month of pregnancy varies from person to person, but usually the belly does not protrude too much yet, and the height of the pregnant woman’s uterus is about 2-3 fingers above the belly button. The size of the belly can fluctuate greatly depending on a number of factors. If a pregnant woman’s belly is too large in the sixth month of pregnancy, it may be due to a fat, thick fat, or twin or multiple pregnancies. If the pregnant woman has gestational diabetes or abnormal development of the fetal digestive system, it may lead to more amniotic fluid, which in turn leads to a larger pregnant belly. In addition, when the fetus is abnormally large or there is a huge mass in the pelvis of the pregnant woman, it may also lead to a large pregnant belly. It is recommended that the pregnant woman go to the hospital for ultrasound examination in time to clarify the cause and then deal with the cause. If the pregnant belly is too small in the 6th month of pregnancy, it may be caused by low amniotic fluid, insufficient nutrition supply, fetus located in the posterior wall of the uterus, or delayed fetal development. In this case, it is recommended that the pregnant woman go to the hospital to check whether the fetus is developing normally. If the small belly is caused by insufficient nutrition, you should pay attention to increase the amount of diet, ensure a balanced nutrition every day, rest properly and participate in moderate exercise to promote the growth and development of the fetus.