| You can continue to feed the kitten, as it this seems to be the most humane thing to do, especially if you have children that are watching. However, I wouldn't count on it surviving in the long term. If a kitten doesn't get its mother's milk, its chances of survival, even with the substitute feeding, are slim.
If it survives the odds and lives, it most likely won't be in pain, even if it lacks some motor skills. Cats are very "gracious" about having disabilities. They make due with what they have, and don't complain. I've had a perfectly happy cat who had only 3 legs, and another cat who was blind but still very happy and loving. The real issue is, will the disability endanger the cat in the future? For example, if the cat was outside, would it be able to run up a tree quickly enough if a dog was after it, or run out of the street if a car was coming, etc. I would encourage you to keep it as an indoor cat if it can't properly defend itself.
If the kitten survives, take it the vet once it's eating solid food, and have the vet do a complete check up. (S)he can advise you further about any special care it may need. And please come back to let us know what happened to the poor thing. I hope it lives! | 
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