So scared of my baby getting sick

My poor little guy got exposed to the flu last week (from grandma) and pneumonia this week (from me). I called his doctor and they said just to look out for a fever and a wet cough (he’s had a dry cough for a few weeks that started right around the time he figured out screaming like a maniac is something he could do for fun). The worst he’s ever had is just a little sniffle. He’s been napping for the last like two hours and I’m hoping it’s just because his sleep routine was all off last night so he’s just extra tired today (he normally maxes out at an hour for a nap). I can’t wait for cold and flu season to be over