What do you do with abandoned baby bunnies?

First of all, you have to check them for any maggots, fleas, or ticks. If they do have them, then you should go to the nearest vet immediately. Then, once at the vet, you should ask the vetrinarian to help you take them out. Also ask him/her to make sure if they have broken bones, diseases, (especially anything contagious), and let them do their work. Once they are done, if they had diseases, let the vetrinarian give them medicine. For the more serious cases, you problably should be waiting outside the door so you don't get infected.