Whether it is normal for the fetus to move especially hard needs to be judged according to physiological factors and pathological factors, etc. 1. Physiological factors: pregnant women after meals for the fetus to deliver enough nutrition, fetal excitement, may increase fetal movement. In addition, pregnant women after bathing at night, warm water stimulation, promote blood circulation, may also increase fetal movement. Fetal movement sometimes more, sometimes less, but in a day counting fetal movement overall normal, that a short period of time of strong fetal movement is normal. 2. Pathological factors: Sudden increase in fetal movement, frequent fetal movement, followed by a gradual decrease or even disappearance of fetal movement, this situation is not normal, may occur fetal hypoxia. Sudden increase in fetal movement, it is recommended to go to the hospital in a timely manner, after a clear examination to give appropriate treatment.