If children have a lot of phlegm, they can eat a light diet, eat Chinese medicine to reduce phlegm and cough, and anti-infection treatment, as follows: 1. Eat a light diet, because many children have a lot of phlegm caused by eating meat or sweets, so they can eat an appropriate light diet, which can help the phlegm disappear; 2. The Chinese herbal medicines commonly used to reduce phlegm and cough include compound fresh bamboo liquid, Jin Zhen oral liquid, etc., which have obvious effect on phlegm and cough. If the sputum is caused by acute bacterial bronchitis, parents can give the child cephalosporin anti-infection treatment. If it is due to mycoplasma infection, you can apply macrolide antibiotics, such as erythromycin, roxithromycin, etc.