Hey,
I've had a breeding group before they all were hand tame, gave them to a friend a few months ago.
Right now I have brought 4 females and 1 male, 1 of the female gave birth without me noticing and they ate the litters. the second female I have notice the moment she gave her first litter birth and the other female's ate it so I separated them.
After 2 weeks I changed the female cage to a bigger one and she ate the 2 week old litters.

Why they eating their litters? got food and water on a daily basic.
The new breeding group are non-tame mice unlike the other group I had, maybe because of that?
Right now I separated the male (all 4 female pregnant), what to do so they won't eat the litters?