If children have cough and phlegm, they can be treated in the following ways: 1. Oral cough and phlegm-reducing herbal medicines: such as oral solution for children with lung fever and cough and asthma, oral solution for children with cough. 2. Oral phlegm-reducing and cough-relieving medicines: such as etanercept, oral solution of aminoglutethimide hydrochloride, etc. 3. Nebulizer treatment: you can use terbutaline sulfate nebulizer, plus inhalation with budesonide suspension nebulizer inhalation, which has a cough-relieving effect. 4. The child can be nebulized with N-acetylcysteine, which has a phlegm-suppressing effect.4. Find the cause: Parents need to be reminded that if the child has cough and phlegm for a longer period of time and the cough is more severe, especially if it is accompanied by fever and other symptoms, it is important to determine the cause of the cough, whether it is pneumonia and bronchitis caused by infection or allergic cough or cough variant asthma caused by allergic factors. The child should be given routine blood tests, mycoplasma antibodies, lung CT and other related tests, and lung function tests if necessary, and treatment should be carried out according to the test results.