The symptoms of cough and phlegm in 2-month-old infants and children can be treated by the following methods: 1. Cefixime granules can be taken for anti-inflammatory treatment because cough and phlegm are caused by bacterial infection in the trachea or bronchial area, and taking antibiotics can relieve the symptoms of cough and phlegm caused by inflammation. 2. Taking pediatric aminoglutethimide oral liquid can play a role in relieving cough and phlegm, which helps If the symptoms of cough and phlegm are severe, parents are advised to give the child nebulization treatment to relieve the symptoms of cough and phlegm. At the same time, parents should also do a good job of caring for their children, patting their backs more often, as well as feeding them more boiled water.