The fetal heartbeat is normal as long as it does not exceed 160 beats/min. A woman will have a fetal heartbeat after 50 days of pregnancy, and the normal number of fetal heartbeats is between 120 and 160 beats/min. When the fetus is hypoxic due to placental aging, amniotic fluid contamination or umbilical cord encirclement, the fetal heart rate will increase and exceed 160 beats/min in the early stage. If the fetal heart rate is below 120 beats/min, it is necessary to pay enough attention to this and give the patient active symptomatic treatment.