Smaller stomach in late pregnancy may be caused by the decrease of amniotic fluid, the fetus entering the pelvis, and the growth restriction of the fetus. 1. Decrease in amniotic fluid: If your stomach gets smaller in late pregnancy, it may be due to the gradual decrease in the amount of amniotic fluid, which usually decreases after the 38th week of pregnancy. 2. Fetus entering the pelvis: In late pregnancy, because the head of the fetus falls into the pelvic cavity, so the pregnant woman’s stomach becomes smaller and more obvious, which is usually a normal situation. 3. Fetal growth restriction: If the pregnant woman suffers from malnutrition, high blood pressure during pregnancy and other diseases, it may lead to the growth of the fetus fails to reach the level it should be, and the belly becomes smaller in late pregnancy. If a pregnant woman has a smaller stomach in late pregnancy, it is recommended that she consult a doctor in a timely manner, and under the guidance of the doctor, improve the relevant examinations to clarify whether there are abnormalities, so as to take appropriate measures.