Peter wrote:

What do I feed a baby rabbit ??

Having worked at a golf course that is overloaded with rabbits this
summer and having seen lots of tiny babies etc, I've noted that they
seem to munch on the grass at the course mostly. I've brought them
carrots just for grins but suspect the adults have grubbed these.
You might call a pet shop and ask them, provided you intend to make
it a family pet.