IF THE KITTENS ARE REJECTED BY THEIR MOTHERS, THEY WILL LIKELY NOT GET FED. IF YOU ENJOY FEEDING THEM (UNTIL SOMEONE ELSE TAKES THEM IN), OR PLAY WITH THEM AND LET THEM GET SUFFICIENTLY FAT AND WELL GROWN, THEN GIVE UP AND DISCARD THEM.
http://wiki.answers.com/Q/How_to_feed_rejected_newborn_kitten
How to feed a pregnant cat?