I'm so sorry Lori. Poor babies. Sore behinds and tummies. I know that they will get better, so don't lose hope. It will get better. Lots of kittens get sick, like Kim said, Momma cats pass things along.
Just think if you did not get them, no treatment and in the cold.. They probably would not have even had a chance.
I am praying for Moxie Moo, Decker, Pops and Twinks. *hugs* to you as well. And please keep us updated! Katie and kitties