Jennifer,
I have a baby wild rabbit right now that is a little smaller than yours. I give her kitten milk replacer with an eye dropper twice a day and she has rabbit food in a dish in with her and a shallow dish of water too. She eats a good bit of her rabbit food , but also likes the milk. We raise rabbits and they are not supposed to be weaned before 8 weeks. Since this wild rabbit is fairly small and I don't know its age, I give her milk just to be on the safe side. She is doing wonderfully but is still really jumpy. I'm hoping to turn her loose behind the house in the woods.