When children have a lot of phlegm, they can use nebulized inhalation treatment to remove phlegm, which can be nebulized with acetylcysteine to reduce the consistency of mucus and make it easy to cough up. When children have cough and phlegm, diet is also important. Children should not eat sweets or foods with too many calories, such as cakes, creams and fried foods, etc. They should not get cold, keep their clothes thick and thin, and keep their respiratory tract moist so as to facilitate the discharge of phlegm.