The oxygen supply to the fetus is the oxygenated arterial blood in the mother’s body circulating through the placenta and umbilical cord to the fetus. When the fetus is hypoxic, there will be three typical symptoms, namely abnormal fetal heart rate, abnormal fetal movement and fetal growth retardation: 1, abnormal fetal heart rate: normal fetal heart rate is 110-160 beats/min, when the fetal heart rate is more than 160 beats/min or less than 110 beats/min, it indicates that the fetus is hypoxic; 2, abnormal fetal movement: normal fetal movement is generally 3-5 times/hour, and the total number of fetal movements is about 30-40 times/12 hours. When the fetal movement is too frequent or too little, it indicates that the fetus may have intrauterine hypoxia; 3, fetal growth retardation: fetal growth and development will become slow or even stop after hypoxia. If the growth of fetal height is too slow or no longer changes, it indicates that the fetus may have intrauterine hypoxia. Generally, if there is any problem with the fetus, the umbilical cord, the placenta or the mother’s body, it can cause fetal hypoxia to occur. Therefore, pregnant women should go to the hospital for regular checkups to observe the development of the fetus and to detect and treat any adverse conditions in time to avoid delaying the growth and development of the fetus or leading to fetal asphyxia.