I am by all means no experienced breeder but this happened with my friends kittens as the mother had Mastitus (excuse the spellling) We would wrap them in a towel so they couldnt move and feed them kitten milk through a dropper (which we got from the chemist).
We found it helped a bit if you held them like a baby aswell - seemed to go down a bit easier!
Good luck! Hope your lil babe is ok.

__________________
Kelsie