A child’s early morning cough is often caused by a dry respiratory system. When sleeping at night, most people breathe with their mouths open, and dry air enters the respiratory tract directly through the mouth without being moistened by the nasal cavity, which can easily trigger dryness of the respiratory mucosa, and when they get up in the morning, the cough will appear due to dryness. Drinking more water before going to bed or adding a humidifier to the house can effectively relieve the cough caused by a dry respiratory system. In addition, respiratory infections can also cause coughing in the morning. When respiratory infections occur, the mucous membranes of the respiratory tract become congested and edematous, and also secrete inflammatory exudates, which can also stimulate the mucous membranes of the respiratory tract and cause constant coughing.