Where possible let the mother rabbit take care of the babies, as hand-rearing a rabbit is fraught with problems. Be aware that the mother only feeds her babies twice a day and she may well leave them unattended for long periods in between. Thus, although the babies may appear abandoned, if the mother can still get back to them the chances are they are not in difficulties. If you know the mother is dead, then feed twice a day (as she would) to tide them over until they are two to three weeks of age, when they start eating solid foods.