In reality yes there are some U12 studs that move on but until they play on the 90' diamond we really will not know. Then there are girls.
My son is only about 4'10 at 11 and I am 5'7 wife is 5'1. We are sure hoping he is more like my parents and grand parents size. My mom is 5'6 and dad was just under 6' with my brother at about 6'1(Yes same parents

Let's face it. You cannot teach size or speed.
Thank God my son has guys like Jimmy Rollins, Brian Roberts, and David Eckstein to look up to for inspiration.