Rabbits only feed their kits once or twice a day and only for minutes at a time. You may never even see her in the nest especially if she knows it's cold and avoids opening it until she has a lot of milk built up to feed them.
I wouldn't start with lionheads even if they are close to being accepted. They still need a lot of work. What other breeds is he interested in? I would think only a handful would not be suitable for a responsible child to start with.