Pregnant women can breathe oxygen, and oxygen does not affect the fetus. Some pregnant women, due to the more obvious fetal growth rate during pregnancy, lead to ischemia and hypoxia in the heart muscle, showing chest tightness, breath-holding, and increased heart rate, which can improve the symptoms through oxygen inhalation, or in the middle and late stages of pregnancy, due to the more obvious fetal growth rate, the fetal heart rate is too fast during the contraction of the uterus, and the fetus develops ischemia and hypoxia, and the pregnant women should also be given oxygen in time to improve The symptoms of fetal ischemia and hypoxia should be promptly administered to improve the fetal ischemia and hypoxia to prevent the fetus from being deprived of oxygen for a long time in the uterine cavity, which may lead to congenital ischemic-hypoxic encephalopathy and affect the baby’s intellectual development or limb movement after birth.