Level 1: Reasons why babies cough with phlegm. It is a very common phenomenon for babies to cough with phlegm. The main reason is caused by respiratory tract infection. Common causes include colds, flu, bronchitis, pneumonia and other respiratory infections. In addition, air pollution, allergic reactions, etc. may also cause babies to cough and produce phlegm. Therefore, before treatment, the cause of its occurrence needs to be clarified. Level 2: Food taboos for babies with cough and phlegm. When treating babies with cough and phlegm, you need to pay attention to some food taboos. First of all, avoid giving your children spicy and irritating foods, such as peppers, ginger, etc.; secondly, don’t give your children