Normally, if the oxygen flow rate is more than 5L/min and the oxygen intake is more than 30 minutes, it can be judged as excessive oxygen intake. Pregnant women are susceptible to intrauterine hypoxia during pregnancy due to low oxygen saturation, which can have a serious impact on fetal growth and development. Therefore, this kind of situation requires a moderate amount of oxygen inhalation to relieve the stimulation caused by the symptoms of the body. However, oxygen intake needs to be intervened reasonably under the guidance of a doctor, usually about half an hour is normal, and exceeding the standard may cause serious problems such as retinopathy of the fundus of the fetus. If there are abnormalities in the body, it is recommended to consult a doctor in a timely manner, do not self-medication, oxygen inhalation, in order to avoid other serious effects.