The need for hospitalization for mycoplasma pneumonia in a 4-year-old child is determined by the severity of the baby’s condition. Mycoplasma pneumonia is the most common form of pneumonia in children, with nighttime coughing, more serious lung infections or poor oral medication, it is best to be hospitalized for fluids and nebulizer treatment. Pediatric mycoplasma pneumonia is contagious, the disease develops faster, if the high fever does not go down and the cough is more laborious, chest CT or plain film shows that the infection is more serious, and accompanied by effusion, it is necessary to give fluids in a timely manner, the effect of oral medication is not good, it is possible to aggravate the condition, hospitalization and infusion of fluids is more effective. So 4-year-old children with mycoplasma pneumonia hospitalized or not according to the severity of the baby’s infection to determine, it is recommended that timely medical treatment, according to the doctor’s assessment and judgment, to give a better treatment plan.