What should I do?

I am the proud step-mother of 4 wonderful kittens! The babies are 4 weeks and 1 day old. I have 3 girls and 1 boy. All the babies are eating solid food, but 1. She is still only eating off her mother's milk. Her mother is trying to wean them, but she follows her around untill the mother gives in and lets her feed. The baby does play with the other's but she also sleeps alot more then the others and she is alot thiner. What should I do?

Well they should ALL be still nursing and continue to be allowed to do so until they are around 10-12 weeks old and they can leave the mom. The thinner one may need a little suppliment and seperate feeding from the rest to make sure she is eating. But you really need to keep them all with her and let them continue to nurse and be with mom until they are much older. Usually you just leave the dry kitten food that mom has been eating out and when she feels like it she will being to show them how to eat the solids. This usually doesn't even begin to happen until 4-5 weeks. How did you manage to get them weaned so early? Or was the mother just refusing to let them nurse?

The mother is still letting them nurse, but not very often. She is tried and kinda frazzed looking! The babies are eating and pooping. (all but that one) I just wanted to make sure there was nothing wrong with her.

Sounds like everything is on track. Don't worry so - as long as they are gaining or maintaining weight all is well