Kittens vet visit and update

The kittens now have names. The larger one is Felix and the smaller, Flurry. They had their first visit to the veterinarian today. Felix got his first shots and a clean bill of health. Flurry on the other hand did not gets shots because she is too small. The vet also has concerns for her size. He thinks that the people we bought the kittens from might have exaggerated their ages a bit and also that Flurry was developmentally delayed to only 4-5 weeks. We'd already figured some of this out and had a few scares with Flurry already. She seems to have digestive problems and feels so uncomfortable sometimes. We've been giving her baby kitten silk replacer and very watered down canned kitten food. Nothing seems to agree with her though. Sometimes Flurry is well enough to play but then later she may go downhill fast. It's a mystery and we hope we can find out what's wrong so she can grow and thrive.