My DD (7) has only been pitching for about three months and of course is only throwing a fastball. In your opinion, when should a pitcher move on to the next pitch (probably change-up?). According to her PC, on her best pitches she is throwing mid to high 30s but can be wild. I have read that you want to be able to throw a strike about 75% (currently 1 out 3) of the time and then work on location (four corners) before introducing anything else. Just wondered she might get bored with same pitch the next 6 months?