How to Handle a Baby’s High Fever, Cough, and Excessive Phlegm?

A 6-month-old baby has a high fever of 38.7 degrees Celsius, and after taking antipyretics, the fever subsided but returned shortly thereafter, accompanied by coughing and excessive phlegm. The question is how to handle the situation. The baby has previously taken antipyretics but the fever returned soon after. Assistance is requested. What medication should be used to prevent high fever, and what medication should be taken to relieve coughing?
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