When to consult a 6-month-old child with a fever for 3 days?

Hello, I have a 6 month old boy who has had a fever for 72 hours. The first day, the temperatures varied between 39 and 40. For the last 48 hours, the temperatures have been between 38 and 38.5 (taken before his Tylenol). The fever is controlled under Tylenol. Secretions ++, we do the ste-Justine method between 4 and 6 times a day. She also has a cough, but does not seem to have difficulty breathing. Good general condition.