Why did my rabbits eat their young?

My rabbits had babies (planned, on purpose, they are full-blooded dwarf) and ate them before I realized they had them. Another breeder told me this sometimes happens in first-time parents, but to try it again and it doesn't happen the second time. Well, I bred them again, separated the parents so dad wasn't in there, and she still killed and was eating her young. I rescued one and it died anyway a week later (after round the clock feedings, warming, cleaning with a warm washcloth, etc). I cannot go through that again! The kids put them back in together to "play" (uggh!) and now she is pulling fur again! Does anyone have any suggestions, has anyone ever had this problem?