a bit of stupid is cutie(just for kid)

I watched two advertisements. One is a little girl knows a plenty of words. Another one is a small boy see some clouds and thinks many things from them, he is much cleverer than other kids.

The kids are so cutie when they look confusing. If a kid knows lots of thing, you will lose fun with him. I don't like the kids make themselves too mature, that's not like a kid! This kind of kids just seems to an adult own a baby face.

I don't mean I like the people who pretend to be stupid. I always see some people say they are stupid, they think that is the way to show them are cutie. I don't think so. No one says you are stupid, but you say it yourself, that's silly.