Last year our bunny gave birth to 11 babies, and then refused to care for
them. We lost two within the first three days, and all the others were
looking very dehydrated. We couldn't let the others die, so we started
feeding them kitten replacement milk with a syringe every 2-3 hours. With
9 bunnies, that meant feedings around the clock, but they all survived and
grew up healthy. We tried several times to reintroduce them to their
mommy, but she would just hide in the corner and cry, and in one case
tried to get violent. So we raised them in a shoe box with towels and her
fur from the nest, then a larger box as they grew.
Our vet recommended the powdered kitten replacement milk, but I later
heard that puppy milk might be better for them. We continued feeding milk
until about 3-4 weeks, then slowly introduced pellets, lettuce and a few
soft veggies.
Good luck.