From what I understand, the overwhelming majority of kids with covid do not require any treatment whatsoever, with only a small handful of anecdotes of kids having bad symptoms.
Just don't let junior visit grandma.
Most kids have no symptoms. If a kid has symptoms, they have a risk of them progressing, and COVID symptoms tend to progress fairly suddenly (or, at least, fairly silently, if you aren't continuously tracking O2 says, which results in a sudden-seeming transition from “mild symptoms”, or even no noticeable symptoms, to catastrophic symptoms.) While kids are far more likely to be completely asymptomatic, testing if they are exposed to determine need for monitoring, especially if they are already noticeably ill (and, thus, if you presumed they are infected, equally ought to be presumed to have missed the high probability in their age group of getting by completely asymptomatic.)
Some of this research is rather worrisome. But it's important to not overstate what it says: we find evidence of lung damage in imagery of a small proportion of asymptomatic adults. (I'm not aware of any imaging study of asymptomatic children).
How significant these imagery findings are, what proportion is from COVID-19 (because if you image a bunch of people without COVID-19 you're going to find some weird things in imagery, too), and what proportion of adults infected would have this are unknown (even the asymptomatic adults who manage to get a positive test result and enroll in an imaging study are not typical). Let alone knowing how common this would be in children.
if the kid turns out to be that small percentage that do need intensive care - you would be kicking yourself.
kids have died from covid complications, they are not immune.
Why is this so hard to grasp? Being a disease carrier is a problem even if the kid doesn't show symptoms, especially it's been established that covid is transmissible with no symptoms.