i took in a feral kitten in a similar state once. his mommy had disappeared and his siblings were getting along ok, since we lived hear a creek with lots of mice and birds and things, but he was the runt and was starving to death. i fed him and won his trust. after feeding him for a couple of weeks, i got him in and took him to the vet, and he weighed one pound. he's now been my kitty for 5 years, weighs 12 pounds, and has slowly grown more bold around strangers as the years go by. he loves to play and cuddle, and he has tons of personality. i love him to death!