Good Luck!! I keep 1.5 mice together and it works well for me. Even see the pappas laying on top of the babies sometimes helping them to stay warm when moms are eating. Of course I dont get to stand and watch them very much, because I have almost 400 breeder mice right now!!! LOL!! I spend most of that time cleaning, feeding and weaning. Then when I am done doing them I get to do the rats and the snakes. LOL!! Oh well, keeps me busy!! Gotta love it!!