During pregnancy, as the maternal metabolism increases, the burden on various tissues and organs increases and the need for oxygen is very high, when the mother is deprived of oxygen, it will affect the fetal development and lead to fetal intrauterine hypoxia. Oxygen intake during pregnancy can mainly increase the oxygen content of maternal blood, which can relieve fetal hypoxia, ensure normal fetal development and prevent fetal neurological development problems. If economic conditions allow, routine oxygen intake is required in the late trimester, depending on the physical condition of the mother and the specific requirements of the hospital doctor. If the fetus is seriously hypoxic, go to the hospital in time to avoid the formation of chronic hypoxia in the fetal cavity.