Covid with babies?

Recently, we have been around someone that has been tested positive for covid. Last Saturday , we around them and this pasted Saturday, he got the positive results. Sunday I started to feel bad. Ive had covid before and it wasn’t horrible for me, thankfully! So I know how it effects me but what about my baby, he’s 10 weeks old.

Has anyone have had a baby with covid? Is it different from adults? Education me, please. What do I watch for? I feel like it’s pointless for me to go get tested so, I’m isolated myself now since I heard we have been exposed.