Dear, please tell me your son's age. Bronchopneumonia is a common infectious disease in children, especially in infants and young children. It is the most common cause of hospitalization for children. Children under 2 years old are more likely to have bronchopneumonia. This disease often occurs in cold season and sudden climate change, often caused by bacterial viruses or fungi and Mycoplasma pneumoniae. Viral pneumonia is mainly interstitial involvement, while bacterial pneumonia is mainly pulmonary parenchymal damage. The main manifestations were fever, cough and shortness of breath. During physical examination, increased breathing, cyanosis around the mouth, fingers and toes, and moist rales in the lungs were found. When the seasons change, pay attention to cold and warm, reduce the time to stay in areas with dense human flow. Avoid breathing or kissing your baby on the cheek as much as possible.