During the 20th week of pregnancy, fetal movement is sporadic, which is a normal sign. Usually between 22 and 25 weeks of pregnancy, the fetal movement is more obvious. In the 20th week of pregnancy, there is only a slight movement of the fetus, which may not be felt by the first-time mothers. The belly of the new mothers is tighter, and the range of fetal movement is smaller at this time, so the pregnant women can not feel the fetal movement. During this period, pay attention to the ultrasound to check the condition of the fetal heartbeat. If the fetal heartbeat is normal and the fetus is developing normally, you don’t need to worry too much, it’s because the time has not yet come. The number of fetal movements should be between 3-6 times per hour.