when i was coaching 10u travel, virtually all of my girls were swinging the old CF9 -11.....the classic teal one
some were 30, some were 31.....some transitioned to 31 from 30........one or two might have even been at 32
they all stayed at the -11 as they increased length; with the smaller ball, a little less mass seemed to make no difference, and they all had good swings, good bat control, generated good bat speed.......as a team, we hit the crap out of the ball
they told us when it was time to move up from the -11 when they started to crack bats lol.....by our first year 12u season, almost all of them transitioned to a 31 or 32 -10.....a couple of the taller/bigger girls transitioned to 33 at some point in 12u
with the smaller ball, i don't think the extra oz of mass helps things as much as good bat control and being able to generate good bat speed; imho by the time girls move up to the 12" ball, that extra oz DOES become a factor, but it's a lot harder to get rid of habits developed from swinging a too big of a bat too soon
guess my .02 is that for most swings at 10u, you aren't going to hurt anything with the -11, and it will become apparent if that bat is too light for them........with the 11" ball, I like to err to the oz light vs oz heavy........your mileage may vary
That classic teal bat was one of the best ever made…I miss that one.
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