Decreased fetal movement at 25 weeks of pregnancy may be due to hypoxia, or it may be a normal physiological phenomenon, you need to consider counting the time of fetal movement and refer to the number of previous fetal movements. 1. hypoxia: if the placental function is good, the umbilical cord blood flow is normal, the fetal body oxygen is sufficient when the fetal movement maintained in the normal range. If the placenta is not functioning well, the umbilical cord is too thin or the umbilical cord is compressed, and the fetal blood supply is insufficient, intrauterine hypoxia will occur in the fetus, and fetal movement will increase in the early stage and decrease in the late stage when the fetus is in intrauterine distress. 2. Normal physiological phenomenon: due to the irregularity of fetal movement before the 28th week of pregnancy, the decrease of fetal movement in some pregnant women is a normal phenomenon. Generally in about 20 weeks of pregnancy can feel the fetal movement, especially obvious at night. Fetal movement is most frequent from 29 to 38 weeks of pregnancy, and after 28 weeks of pregnancy, if fetal movement is less than 10 times/2 hours or 50% less, it often suggests fetal hypoxia. It is recommended that women in pregnancy should take obstetric checkups on time, monitor the fetal movement in the middle and late stages of pregnancy, and consult with a medical professional for any discomfort, so that professional measures can be taken to intervene in a timely manner.