Fetal hypoxia does not have any abnormal reaction in adults, but fetal hypoxia is prone to abnormal fetal movement, which is manifested as rapid fetal movement and sudden stop, and also can be manifested as abnormal fetal heartbeat, slow fetal development, etc. The specific abnormal performance is as follows: 1, fetal movement abnormal: under normal circumstances, when the fetus appears signs of fetal movement, will be rhythmically and regularly moving about 30-40 times within 12 hours. If there is a sudden increase or decrease in fetal movement for a long time, and there is no regularity, or even sudden stop after rapid fetal movement, it is likely to be an abnormal reaction of fetal hypoxia; 2, abnormal fetal heartbeat: under normal development, the fetal heartbeat is regular, 110-160 times/minute. If you find that the fetal heart beats more than 160 times/minute, the fetus may be in early hypoxic state. If the fetal heart beats less than 120 times/minute, the fetus may be in the late stage of hypoxia, need to seek medical attention; 3, the fetus development is slow: the pregnant woman normal diet, nutrition in place, the fetus will gradually grow with the increase of pregnancy week. However, if there is not enough oxygen in the uterus, the fetus will grow slowly or even fail to grow. After 28 weeks of pregnancy, the height of the uterus will increase by about 1cm per week. When a pregnant woman finds that there is no sign of growth for 2 weeks, the fetus may be in a dangerous state of oxygen deficiency. If pregnant women find the above abnormal performance, they should go to the hospital in time to have ultrasound and other examinations to confirm the diagnosis. If it is confirmed that the fetus is hypoxic, it is best to take oxygen treatment in time, and pay attention to rest and preferably not to exercise strenuously.