My colt was born on April 23rd. I've had him a little less than a month now, and in that time, he's shot up like crazy. His mother is recovering in weight, and only stands about 14 hands at max. She's very small boned and just generally a small horse. She's been on a diet to help her gain weight. She is on 4 quarts of mare and foal feed twice daily, 24/7 grazing, 24/7 access to a coastal round bale shared with 5 horses, (we are putting a 2nd round bale out and dividing the herd up this week into two pastures), and I give her a pound of soaked beet pulp at night.As I said, she's pretty small, and right now the colt has grown up so tall that he ducks down pretty far to nurse. In the past week he's become extremely independent and wanders off quite far frequently. The mare quickly realizes he's wandered and goes and collects him after a while. He follows the other maiden mares around and spends a lot of time with them away from mother but never tries to be a baby with them (if that makes sense).Anyway, I've noticed he's lost a lot of interest in nursing and is much more interested in eating grain and hay with mommy. I know he's a growing boy, and I just guess I'm not this accustomed to such an independent colt at this young. Should I be concerned and possibly change his diet to continue supplementing him with the less he's nursing? He is playful, at a good weight, and growing like a weed, so I don't believe it is an issue with being ill. Any advice from those with more experience with independent foals?