Clumping litter is very bad for kittens. My babies were eating it, so I switched to Swheat Scoop. I would wait until they're 4 months old, but that's just my opinion! Stay away from clay litters, they can harm the kittens. Use something natural, like Swheat Scoop or Yesterday's News!
they aren't actually eating real food yet. They lick canned food and I think they might have just started nibbling on dry but they are still nursing. Stormy is the only one that is doing it. Just gets some in her mouth and then spits it out I think she just likes playing with it. They are five weeks old today.