The middle of pregnancy generally refers to the time period from 13+6 weeks to 27 weeks of gestation, the baby’s fetal movement is frequent at this stage, which can be seen in both physiological and pathological conditions. 1, physiological factors: fetal movement generally refers to the maternal perception of fetal development to a certain degree, movement in the uterine cavity, the first maternity more in the 18-20 weeks of pregnancy, the time of maternal fetal movement is relatively early, generally with the increase in the week of pregnancy fetal movement frequency and frequency or gradually increase. After meals, after bathing, music stimulation, strenuous activity and dialogue and communication with the baby, there are generally frequent fetal movements; 2, pathological factors: the number of normal fetal movements is generally not less than 3-5 times / hour, not less than 30-40 times / 12 hours, generally with regularity and rhythm. If the fetal movement is too frequent, it may be caused by pathological factors, such as fetal hypoxia, the number of fetal movements increases at the beginning of hypoxia, and then decreases as the hypoxia worsens, and rescue measures should be carried out as soon as possible. In addition, placenta abruptio, placenta praevia, umbilical cord encirclement and other factors can also cause frequent fetal movement. If frequent fetal movements are diagnosed to be caused by pathological factors, fetal heart monitoring should be performed to observe the condition of the fetus in the uterus, and if necessary, ultrasound should be performed to check the condition of the fetus in the uterus as well as the condition of amniotic fluid, placenta and umbilical cord to prevent adverse consequences.