My DD is 10 years old, 5'4" and 140 lbs. This all-star season (we just finished our fifth tournament) I think she's played 2 games where she's been the biggest kid on the field. It's more common for her to be about average-sized compared to the competition. I don't think it's safe for a small 6-year-old to be playing against kids that size. How do you think she'd do if she's sliding home and collides with a catcher twice her size? How would she do if the shortstop applies a hard tag to her when she's trying to steal 2B?
I also don't think that it's a great match socially. DD and her teammates are starting to talk about boys and hair and puberty and other conversations that aren't the best subjects for a kindergartener. And it's possible that 10U teammates might not want to have anything to do with a kid that young. They might treat her like a cute kid sister but not as an equal.
She's so young and right now the focus should be on fun and not trying to find her the toughest competition. At this age the most important thing is learning to love the sport.
I also don't think that it's a great match socially. DD and her teammates are starting to talk about boys and hair and puberty and other conversations that aren't the best subjects for a kindergartener. And it's possible that 10U teammates might not want to have anything to do with a kid that young. They might treat her like a cute kid sister but not as an equal.
She's so young and right now the focus should be on fun and not trying to find her the toughest competition. At this age the most important thing is learning to love the sport.