Fetal immobility at 37 weeks may be caused by fetal sleep, intrauterine distress, fetal death and other conditions. 1. Fetus in sleep: pregnant women are often conscious of fetal movement around 20 weeks of pregnancy, fetal movement with the progress of pregnancy gradually strengthened to 32 to 34 weeks of pregnancy to reach the peak, after 38 weeks of pregnancy gradually reduced. Fetal movement is obvious at night and in the afternoon; in the fetal sleep period, fetal movement disappears and lasts about 20~40 minutes. After 28 weeks of gestation, the normal number of fetal movements is ≥10 times/2 hours. 2. Fetal intrauterine distress: Fetal intrauterine distress can be caused by insufficient blood oxygen content in pregnant women, placental dysfunction, fetal abnormalities, etc., which manifests itself as abnormal fetal movements, starting with frequent fetal movements, followed by reduced fetal movements and disappearance of fetal movements, etc.; when the fetus is in intrauterine distress at 37 weeks’ gestation, it needs to be dealt with immediately, and emergency caesarean section is necessary to end the pregnancy. 3. Fetal death in the uterus: due to placenta praevia, placental abruption, fetal growth restriction, gestational diabetes and other reasons can lead to fetal death in the uterus, manifested in the disappearance of fetal movement of the pregnant woman’s own consciousness; stillbirth is diagnosed as soon as possible, as soon as possible to induce labor. If the fetus does not move at 37 weeks of pregnancy, consult a doctor as soon as possible, complete the examination under the guidance of the doctor to clarify the cause and give timely treatment.