The airways of children are dry, soft and narrow, and the characteristics of pediatric cough mainly include the following: 1. There is more sputum secretion, and once the sputum is secreted, it is easy to block the airways and make breathing difficult; 2. The airways of children are soft and narrow, and when the airways are stimulated by inflammation, airway hyperresponsiveness can occur, often accompanied by symptoms of wheezing, wheezing pneumonia, capillary Bronchitis is more common; 3. The cough of the child shows a dry cough in the early stage, and as time lengthens, secretions will appear, manifesting as coughing, coughing sputum, coughing yellow sputum; 4. The child’s chest pressure is more sensitive, and during the coughing process the chest pressure will increase more obviously, and a pneumothorax will appear; 5. Compression of the esophagus, gastroesophageal reflux appears; 6. Bleeding spots appear due to the rupture of capillaries in the face.