Never had any problems with canabolism with my mice, first time mothers or otherwise. The only time I had a female start killing her babies was when I was cleaning the bins, and that was the day the only pregnant female decided to have babies. I didn't notice because she still looked quite big, and only had about 6 babies so I must have interrupted her labor.



As for putting a couple hopper males in with females, I haven't had any luck with that. I can keep brothers together without much fighting but two brothers and a bunch of females resulted in one male being badly biten. The second male was only in there because I mis-sexed him.



How I house my mice is in deep sterlite containers with a mix of pine shavings and shredded newspaper with a couple coffee/drink trays cut in half. I also put in toilet paper tubes. I also try not to clean on the days they have babies, to eliminate stress, waiting about 2 to 3 days after the last batch of babies to keep them from killing and eating their young.

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