The absence of fetal movement may be due to the pregnant woman’s own reasons, small fetus or fetal oxygen deficiency. 1, the pregnant woman’s own reasons: if the pregnant woman is too fat, or too much amniotic fluid, it will affect the pregnant woman’s feeling of fetal movement, may feel too little fetal movement or no fetal movement; 2, the fetus is small: if the fetal character is quiet, or the fetus is small, the force of activity is also smaller, the pregnant woman can detect the number of fetal movement is less, manifested as a long time can not feel fetal movement; 3, fetal hypoxia: umbilical cord twist obstruction When the blood transport, causing fetal hypoxia, fetal movement will immediately disappear, endangering the life of the fetus. If it is because the placenta is weakened, it will lead to chronic fetal hypoxia in the uterus and fetal movement will gradually weaken. Usually, the fetal movement is felt at 18-20 weeks of gestation, gradually coordinated and regular from 28 weeks, and the number of fetal movements starts to increase at 32 weeks. Pregnant women should start to self-monitor fetal movement at 28 weeks of gestation, and measure the fetal movement for 1 hour in the morning, midday and evening, and multiply the number of fetal movement by 4 to get the number of fetal movement in 12 hours, and the number of fetal movement > 30 times/12 hours is the normal range. When pregnant women count abnormal fetal movement or can not feel fetal movement for a long time, they should go to the hospital for examination, clear diagnosis and appropriate treatment and treatment.