If a newborn coughs and has phlegm, it is mainly considered to be caused by the following reasons: 1. respiratory tract infection, the child coughs and has phlegm due to acute bronchitis and acute bronchopneumonia. In this case, the child can be given targeted treatment. If the respiratory tract infection is caused by bacterial infection, anti-infective drugs such as cephalosporin need to be applied in a timely manner, together with the treatment of Chinese medicine to reduce phlegm and cough, such as the application of Jin Zhen oral liquid and compound fresh bamboo liquid, and the child’s cough and phlegm will be significantly improved after about 7-10 days of treatment. If the improvement is not obvious, nebulized inhalation treatment can also be added. 2. Allergic causes, often due to milk protein allergy, after the child eats milk, due to allergic symptoms in the respiratory tract, thus feeling the symptoms of phlegm in the throat, there will also be an irritating cough. In this case, it is necessary to apply amino acid milk powder and deeply hydrolyzed protein milk powder to the child in a timely manner.