A bouncing stomach may be the fetus moving, or it may be activity created by the fetus hiccuping. Around 16 to 20 weeks of pregnancy pregnant women will feel fetal movement, the fetus rolls over in the uterus, kicks when the impact of the abdominal wall, pregnant women will be able to feel fetal movement, may be the stomach jumping activity, or other different feelings. Around the 28th week of pregnancy, when the fetus hiccups in the uterus, the pregnant woman will also feel a more regular beating in a certain part of the stomach, which lasts for 2-5 minutes or 10-20 minutes each time. It is caused by the stimulation of the diaphragm muscle when the fetus swallows the amniotic fluid, and it is also a manifestation of the diaphragm muscle in development. After 28 weeks of pregnancy, pregnant women can learn to count the fetal movements by themselves to find out whether the number of intrauterine activities of the fetus is normal or not, the fetal movements are 3 to 5 times in an hour, and about 30 to 40 times in 12 hours. At the same time, do a good job of pregnancy checkups, in order to know whether the normal intrauterine development of the fetus.