4 months old flu & cough

My baby is currently in IFC and suddenly he develops flu, and coughing. 4 months old. He’s never coughed like this or even had flu before, breaks my heart. Is there anything i should do as theres no medication for small babies. He’s still drinking well and active. Currently just using sterimar spray, nasal suction & iliadin nasal drop. Also garlic balm on his chest, back and bottom of feet #firsttimemom