The baby’s regular movement in the tummy is due to hiccups caused by the baby’s twitching while in the mother’s tummy. Since the baby’s diaphragm is relatively low, when the intestines move, it will touch the diaphragm, thus causing the baby to have hiccups; or when swallowing amniotic fluid, due to the elevated position of the stomach, it will also touch the diaphragm, thus causing the baby to have hiccups. When the baby has hiccups, due to the imperfect development of the brain nerves, the limbs will be twitching at the same time, so the pregnant woman will feel the baby’s rhythmic throbbing, which mostly occurs in the lower abdomen of the pregnant woman. After the baby is born, there will also be such rhythmic hiccups, which are normal physiological phenomena, do not worry.