This is what I found yesterday morning when checking on my mice colony!
http://tarazod.com/other_hosted_pics/35pinks_sm.jpg
35 pinks in one pile! :D
http://tarazod.com/other_hosted_pics/35pinks-2sm.jpg
This was from three mothers. If you look closely, you can tell one litter is 2 days older than the others.
I thought they might not be able to feed all of them well. So I transferred a dozen of them to some other moms that only had small litters. They are all doing great now.