Velocity Progression

Bum, Jr. threw 62 at age 12.  He was the smallest kid on his team.  One of the coaches had a radar gun and clocked him.  Three or four kids on his team threw harder but none of them currently play the game.  He threw maybe 65 at 13, 68 at 14, 72 at 15, 80 at 16, 89 at 17, and tapered off from there to cruising 88-91 tops 92.

Still the shortest pitcher on his team but good enough to play professionally.

Trust me when I say it matters NOT how hard you throw at 11.  The hardest throwers then are actually at a disadvantage as their arms are often toast by the time they get to h.s. due to overuse.  Bum, Jr. rarely pitched until 13.

Velocity gains aren't a linear thing, either. We had a HS sophomore go from 70-79 within 6 weeks of training, then sit there for months despite training his butt off.

3-4 months later, he now cruises at 86 and can hit 88 a few times per game. 

But measuring velo and making that the focus below high school is not the right idea. Keep the game fun and don't overuse them on the mound.

It all means nothing until puberty. Don't let him pitch too much at a young age, learn to throw strikes, change ups and most importantly have fun. 

I would say my son was pretty much in line with the numbers here shown for Bum Jr. +2.

As for my son's height, he's 6' 2" just finished his Jr. year at college. . . to help with some perspective.