Treatment for Baby Boys with Cough and Phlegm

Baby boy has a fever, cough, clear runny nose, and phlegm. After taking medication for 5 days, the fever has mostly subsided, but there is still phlegm when feeding and drinking water. Previous treatment and effectiveness: Has taken children’s cold relief tablets and lung tranquility granules. What kind of help is needed now? What causes the baby’s phlegm and how should it be treated?
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