If the child has phlegm, it can be treated by the following methods: 1. If the child has more phlegm and it is sticky, and even if the child has different degrees of respiratory difficulty, it needs to be treated by nebulization in time, and drugs such as acetylcysteine can be used for nebulization. 2. If the child only has more phlegm, but it does not affect the child’s respiratory function, this situation can be 3.If the child’s coughing symptoms are mild, it is not recommended that the child take a lot of drugs to treat the symptoms.