Infants and children with pneumonia need oxygen, generally according to the blood oxygen saturation to adjust the flow, and then according to the oxygen flow to calculate the oxygen concentration, general mild hypoxia, oxygen flow is 0.5 to 1l/min, moderate hypoxia for 2 to 4l/min. severe hypoxia for 5 l/min. oxygen concentration formula is: oxygen concentration (%) = 21 + 4 × oxygen flow (l/min), according to this According to this formula to calculate the oxygen concentration, the normal infant oxygen concentration is about 35%, infants and children should continue, low flow, low concentration of oxygen, to improve the lack of oxygen, to ensure the early recovery of children’s health.