I hope the kids was ok, but I have to admit I did laugh, I guess i assumed the kid was okay if they posted it... but maybe not.
Either way, in places like that, the parent should have been holding their kid. Especially if the child hasn't learned how to stay out of dangerous situations like that. I know a lot of kids that age that would know better than to do something like that, but I guess it was a new environment and the kid didn't know they danger.
I don't think it's an issue to have a kid, but carry or hold your kid during those parts.. especially if they haven't learned to be careful.