They can eat their young whenever stressed; usually when someone bothers the nest. Maybe to count the babies. Never bother a doe that has recently kindled; do not clean the box for a while after the babies are born.
I have been breeding rabbits for over 30 years, and during that time, I have had exactly 1 doe that intentionally savaged her litter, and she did it more than once and without unusual provocation. I handle babies within hours of their birth, regularly bring litters into the house during cool weather, and even relocate the does and their litters if necessary. Most of my rabbits have been completely unfazed by any of this. Half a century ago, rabbits may still have been touchy enough for the warning about does eating their litters to be valid, but the modern rabbit breeder is usually pretty hands-on, and IME, this advice is, at best, very outdated.