5-month-old babies with phlegm symptoms need to be based on the specific causes of different treatments: 1, due to bacterial infection of the trachea and caused by cough, cough phlegm symptoms, can be treated by taking antibiotics, clinically more commonly used amoxicillin granules, azithromycin dry suspension, etc. 2, viral infection of the respiratory tract and phlegm symptoms caused by the treatment of antiviral oral solution and other medications.3, You can take the snake gall and Sichuan shellfish liquid, compound fresh bamboo leech liquid and other drugs that have the effect of clearing lung heat, cough and phlegm to relieve the symptoms of cough and phlegm, and you can also take Ambroxol Hydrochloride Oral Solution for phlegm treatment. 4, if the symptoms of coughing and phlegm is more serious, the parents can be through the way of nebulization to alleviate the symptoms of coughing and phlegm of the children, and should be diligently to the children to pat their backs, and feed the children to drink more lukewarm water.