Infants with colds and phlegm coughing can be used in the following ways: 1, oral phlegm removing drugs, such as Ambroxol, acetylcysteine, compound fresh bamboo leaching liquid, etc., these drugs can help phlegm dilution, promote phlegm elimination; 2, the use of nebulized inhalation method of phlegm, such as p-acetylcysteine nebulized treatment can play a phlegm effect, but the use of p-acetylcysteine nebulized to pay attention to the smallest babies, less than 2 years old is not recommended. However, when using acetylcysteine nebulizer, it should be noted that it is not recommended to be used for babies under 2 years of age, so as to prevent the phlegm from being re-aspirated into the trachea by mistake after dilution and lead to suffocation.