Good evening everyone! The elder son has infected the younger one, he'…

Good evening everyone! The elder son has infected the younger one, he's two and a half months old. Cough with phlegm, no fever. He's restless, doesn't take any mixture, only breast milk, it seems like his throat hurts... I called the doctor tomorrow. Anyone with similar symptoms? What do you do? I put Viferon in him. And I spray Ksyl May nasal drops. By the way, the nose is not blocked.