The baby’s fondness for arching its stomach in late pregnancy is a phenomenon seen in pregnant women as a result of the greater mobility of the fetus in the uterus. The reason for the occurrence is related to the fetus changing position, limited space for movement, and fetal distress. 1. Fetus changes position, the fetus is larger in late pregnancy, when the fetus moves in the uterus, the pregnant woman will feel an arching sensation in her stomach. This is normal fetal activity, if the fetal movement is normal, it is not an abnormal phenomenon. 2. Restricted space for activity, the fetus increases in size in late pregnancy, the amniotic fluid gradually decreases, the fetus in the uterus is restricted space for activity, when the fetus moves, the pregnant woman will have a more obvious feeling of the stomach arched up. 3. Fetal distress, fetal ischemia and hypoxia in the uterus, there is an increase in the number of fetal movements, so pregnant women will feel that the fetus in the stomach frequently arching the stomach. When this phenomenon occurs, you need to go to the hospital to do fetal heart monitoring and ultrasound to determine the condition of the fetus.