Actually, my non-CAH son is the one with this problem! We also stay away from too much of the constipating foods like apples (and apple juice), rice, bananas, dairy, etc. Prune juice works great for many kids, IF you can get them to drink it! Someone told me long ago about mixing prune juice with rootbeer - I know! It sounds gross!!, but actually tastes quite good, and my son would drink it then. If things get really "backed up", we use Senekot syrup ... works wonders. For us, adequate veggies, fruit and fiber are key. Good luck!