There are several main reasons affecting the production of phlegm in the baby’s bronchial throat, the first, infectious factors, mainly viral and bacterial infections damage to the mucous membrane, resulting in congestion, edema and exudation of the mucous membrane, it produces phlegm. Mainly infectious diseases, control the infection, give antibacterial drugs, antiviral drugs. Resolve phlegm and cough, and also calm asthma. Mucosolvan syrup can be used to reduce phlegm; cough can be suppressed with chloramphenicol, which has an age restriction on its use; and asthma medication Ertanzine, which can be used.