I had3 litters 10 days early, at this time they are just "balls". Basicly what happened with the first two times one doe had her babies and a few hours later the doe beside her did. They(as in a few long time breeders Ihave spoke to)say if one doe goes into labor or misscarries and there are other pregnant does around it is likely and happens that some or all of the other does go into labor too. I am not sure how comman it is as I have only had it happen once. I also had one doe who got "double" pregnant. She ended up having 4 babies on time from one buck and 5 babies 6 days early by another buck(they got loose in my room). All of the babies ended up dying, a few where DOA, 3 of the early ones died soon after, 1 of the early ones made it to 2 weeks and 1 of the early onesmade it to 4 weeks. They where not peanuts, no one can convence of this though they have tried :?
The baby with it's leg gone could probably live but the pain... unamaginable I would expect. I have a friend who use to breed who had a 4 week old baby get it's foot caught under something(I think it was a resting board she had in the cage or something). A vet showed her how to take care of it. It lost it's foot but was a great bunny pet and type wise. As far as I know he sired a litter before she quite breeding so it odviously did not hamper him much.