As one person pointed out first time does can have problems. We got a doe that had never been bred before. She had 7 kits im her first litter and between 2-3 weeks old five of the seven died. She had 5 with this second litter and all five are now 7 1/2 weeks old and have done great.
I am glad to hear that your remaining babies are doing a lot better, and that the KMR helped, and that you posted that information on the pedialite. That is something I want to keep I mind for future reference. A couple of things I have read that you may or may not want to keep in mind for future reference is if something happens to a doe and she isn't feeding her kits first choice for hand feeding is doe's milk, whether giving kits to another doe or expressing the mother's milk to feed them. If that isn't possible, second choice was goat's milk which you can buy at Wal-Mart in the dairy section (I work at a no-kill cat shelter and this is also recommended by some vets as better then KMR). KMR was actually listed as the third or fourth choice. Also the doe produces certain feces that the kits eat to help their ph levels in the gut adjust to eating solid foods. I am not sure what age kits need to start eating this or how long it needs to be fed to them, but it is a necessity or hand fed young kits won't survive. Picture a bunch of grapes...how you have one big bunch comprised of individual grapes. That is sort of what that particular feces looks like. If i still have the picture on my computer (I am on my tablet right now), and you are interested in this information i can try to send it to you through personal message on this site or post it as a reply in this thread.
Thanks! The vet I talked to mentioned cecotropes and explained its importance to their health. He said they should eat their own when they are big enough and since they were at 3.5 weeks old when the doe died they should be just fine. The bunnies are 3 days shy of 5 weeks old and I'm starting the weening process and acclimating them to the cooler temperatures of our covered shop where we keep the other rabbits. They like to sit on top of one another against the wire and touch fur with our breeding doe who's cage is beside theirs. It's pretty cute, but don't worry there is space to slide a divider between cages when its about time for the doe to have her next litter.