Raising Rabbits website shares one approach to helping a mother doe (rabbit) if she needs a little help with her kits (rabbit babies).
Only rarely does a mother rabbit truly abandon or ignore her babies. This may occur when a very immature rabbit gives birth. In which case, she usually does not build a nest or make any preparations. Her milk production can also delayed. Sometimes the babies can be hand fed for short time until the mother rabbit can take over the job.
A mother rabbit does not lie down in the nest, as a cat would do, but stands over the babies to nurse them. She does, however, clean them and lick their bellies and bottoms to stimulate pooping.