Our kittens are 5 weeks old today and 1 of them wont stop eating litter. I have been trying to wean him from mamma but, unlike his sisters, he has NO desire to eat food. Get him near litter and he goes crazy eating it. It is tidy cats non-clumping clay litter. He is not just giving it a nibble to taste it, he is trying to eat mouthfuls! Anyway, his sister is now starting to nibble at it too. I think it's because she's watching him do it. I don't know what to do. Should I take away the litter box and just keep cleaning up the messes until he is older?