After the fetus is in the pelvis, the number of fetal movements will decrease and the amplitude of fetal movements will also decrease. In general, the range of fetal movement decreases due to the restriction of the fetus after the pelvic stage, which is a normal performance. However, the number of fetal movements should not be less than 3 times per hour, if it is less than 3 times per hour or more than 6 times per hour, it is not normal. This will affect the fetus and lead to ischemia and hypoxia in the uterus, and in serious cases, it will also lead to fetal asphyxia, which may affect the number of fetal movements. If the number of fetal movements decreases or increases, ultrasound is needed to check the fetal development. If it is determined that the fetus has intrauterine ischemia and hypoxia, oxygen should be administered in time to improve it, so as to avoid prolonged ischemia and hypoxia affecting the health of the fetus.