Our youngest also had Croup last year, which is pretty scary if you don't know it. It shows up as a horrible, barking cough, and can make it look like your baby is suddenly struggling to breathe. We panicked and called an ambulance. The little one was just fine, but had the horrible cough (which is much worse at night) for a while.
Once our pre-school care re-opened (it was shut for many months after March 2020) and the regular diseases started circulation again, it felt like we were ill for several months, albeit with different diseases. We'd send our kids in on Monday, and wait to see what we'd have for the weekend...
I'm not saying this to complain - as I see it, this is the reality of life with the little snot-nosed monsters.