In the late stage of pregnancy, due to the progressive enlargement of the fetus, resulting in the narrowing of the relative space of the pregnant woman’s own organs, which causes various discomforts, the pregnant woman will feel tightness in the chest. Once the chest tightness occurs, most pregnant women will consider whether the baby will have symptoms of oxygen deprivation. Once the baby is hypoxic, there will be two situations. First, the fetal movement will appear abnormal. Secondly, the heart rate of the baby will be abnormal. These two ways can be used to determine whether the child has a lack of oxygen. If the fetus moves a lot on a certain day, it is possible that the child is suffering from hypoxia. If there is no more fetal movement, or no movement for several days, go to the hospital for fetal ultrasound to see if there is any problem, so as not to delay the condition. In addition, after the second trimester of pregnancy, it is recommended to do fetal heart rate monitoring at 2 weeks to see if there is any abnormality in the child’s heart rate, and to know whether the child has hypoxia in time.