My son was maybe 5'2, 110 at 14....by the time he graduated HS he was 5'11, 160 with an exit velo of 90 and throwing 90 on the mound. At 14 he wanted to play D1 baseball, but looking at him you'd have thought that that was the craziest idea in the world. He kept working at the game....and finally grew. Things worked out. You can't control height, you do have some control over weight, both with nutrition and workouts. As others have said, considering his size, you've got a couple years until things even start up with regard to recruiting. Have your son control what he can up to that point....the coaches will decide if he fits their program