The fetal heart rate should be 160 beats/min for more than 20 minutes, but the hypoxia should not be judged only by the fetal heart rate for a period of time, but also by the fetal movement and the baseline change of fetal heart rate. The normal fetal heart rate should be between 11O beats/min and 16O beats/min, with an up and down curve. Fetal movement is a normal physiological activity of the fetus. If an otherwise active fetus is suddenly quiet, or an otherwise quiet fetus is suddenly restless, and the fetal movement is less than 10 times/12 hours or more than 40 times/12 hours, it is possible that the fetus is suffering from intrauterine hypoxia. These abnormal fetal movements are caused by the fetus to reduce oxygen consumption or hypoxia affecting the central nervous system. The normal fetal heartbeat is regular and strong, ranging from 11O times/min to 16O times/min. If the fetal position is normal, it can be heard by the father-to-be with the help of a simple device on the left or right side of the lower abdomen, where the fetal back is located. Before the fetal movement decreases, the fetal heartbeat becomes too frequent, if it exceeds 160 beats/min, it is a sign of early fetal hypoxia; if the fetal movement decreases or stops and the fetal heartbeat is less than 120 beats/min, it is a sign of late fetal hypoxia. Since it is difficult to determine whether the fetal position is normal or not, the location for listening to the fetal heartbeat should be at the place designated by the doctor. However, it should be noted that if the fetal heartbeat is abnormal, it should be listened to at an interval of 20 minutes. A transient fetal heartbeat of 160 beats/min or more does not indicate hypoxia. If the fetal heartbeat is fast, it should be listened again when there is no fetal movement. Once pregnant women and fathers-to-be catch the above abnormal signals, they should go to the hospital in time so as to clearly diagnose whether the fetus is hypoxic in the uterus, so as to correct the cause and ensure the smooth and healthy growth of the fetus.