Constipated Kitten?

One of Shinobi's kittens seems to be constipated - he squats in the litter box and cries for a minute or so, then climbs out and drags his bottom along the carpet. They've just started eating solid kitten food, so is there anything I can do to help him out?

Is he peeing ok? You want to be sure of that. If he's peeing but not pooping, maybe give him a *small* amount of canned pumpkin or baby food squash? This is good for constipation. I'd make sure there's nothing else added (except water). Try mixing it in with his canned food.

*laughs* I'm going to have to find which one it is again... three of the kittens look pretty much identical, I've lost track of which one had the problem.