Babies was wrong, you're right. In fact, from what I've learned since that post is that children aren't showing much in the way of symptoms at all and most kids are quite resistant to this strain.
This can be a problem as well though as children can have COVID-19 without even knowing it, which makes it hard to contain in some cases.
But yeah, I was mistaken with babies. The primary threat is to 60+ and people with pre-existing respiratory conditions.