I got about 10 mother with babys right now. they all have large liters. 13 babys or more
and they all have had liter before and have done fine,but this time i got babys died in alot of the cages, In some of them i have had babys missing.I just want to know if it is normal for this? in the past they all have done just fine and never lost any babys. All the mother and babys look and act great but this week every day i find died babys. And one more thing all the mother are young 6 months or younger. And i have one more ? what is the age that you should stop breeding?

thanks
jeremy