(Cicero, Illinois, United states)
My kitten, Mickey, hasn't been eating and sleeps A LOT! She has lost a lot of weight and I'm starting to get worried. What is wrong with her?
Without knowing significantly more information about your kitten's illness symptoms, the possibilities of what is wrong are endless. Without knowing your kitten's age, the duration of these symptoms, and much more, any number of things may be wrong.
However, any time a cat does not eat, even for a day or so, a trip to the veterinarian is in order. Please see my page on Cat Illnesses for help figuring out when your cat needs to be examined by a veterinarian.
I'm sorry that there isn't more I can say or do to help, but what your kitten needs most is an examination by a vet.
All the best,