Here is what we feed babies at The Rabbit Haven. I think others on here (Sarita maybe? Not sure) have mentioned slightly different diets, but the idea is the same.
- Unlimited alfalfa hay. This can be mixed with a timothy, orchard grass or oat hay if you want them used to the taste of adult food. Babies are compulsive nibblers, they'll browse anything you put in the pen.
- Unlimited alfalfa pellets. We use the Oxbow 15/23.
- veggies - we feed veggies as soon as the babies show an interest in solid food, somewhere around a month. This is based on the recommendation of our top rabbit vet, Dr. Carolynn Harvey. My three week olds are already swiping greens from mom's portion. Since they are small, the amounts are smaller than an adult would get, and I stick to the reliable ones that don't usually cause tummy troubles: italian parsely, carrot tops, red leaf and romaine lettuce and escarole.
Babies are super active! They bunny 500 and binky like crazy, and they'll appreciate so space to run around in. Mine like a tunnel I made from them out of a long rectangular FedEx box, and they are also chewing a small cage mat I gave them. Boxes with holes are great, although they seem to spend more time on top of the boxes that in them.
The more you can handle them at a young age, the more adoptable they will be. Babies raised in foster homes that interact with them like people, and really connect with adopters.
Have fun with this! I made a video of my last batch of babies, I may have to do it again. Keep posting pictures, yours are adorable!