Rapid trembling fetal movement, consider the possibility of rolling over or intrauterine hypoxia may occur. 1. Rolling over: the fetus does not remain in one position in the stomach, but often changes position and rolls over. When the fetus rolls over and changes position rapidly, rapid trembling fetal movements will occur. 2. Intrauterine hypoxia: when the fetus is hypoxic in the uterus, there will be frequent fetal movements in a short period of time, and then there will be a gradual decrease in fetal movements until they disappear. Fetal movement in the form of rapid trembling is considered to be the possibility of rolling over or intrauterine hypoxia. It is recommended that pregnant women should pay attention to the observation of fetal movement during pregnancy, if you feel abnormal fetal movement, you must go to the hospital as soon as possible to rule out the possibility of intrauterine distress.