12U DD is 5'4", 100lbs and uses a 32/20. She can't hit it out of the park but can drive it about 180. After 3 tourneys this spring she is hitting .500 with one in the park and a couple of standup triples. She started using a -13 last year and I noticed it came around very fast an no pitcher was too fast. Obviously the new bat is a -12 and two ounces heavier but still very fast. I am a fan of the light bat for smaller framed girls.