I'm sorry- I wasn't getting emails that people were responding!

I ended up putting just Momma and the sick kitten in the bathroom and removed the healthy kittens. I tried for about an hour and Momma took care of the sick and he started to perk up. Last night I left it just Momma and the sick one in the bathroom all night and the vet was pleased with his improvement from yesterday. He is still pretty sick but we are at least seeing a move in the right direction. He also ate a whole kitten can of food mixed with formula- without me forcing him!!!! I need to keep feeding him often and giving him lots of chances with just Momma. He is healthy enough to be spending time with his litter mates but night time is to be just the sick one and Momma. Momma now has a bad case of diarrhea that we are treating her for and I need to keep an eye on everyone for signs of that.