Introducing new female mice into established colony

[Snakefood]

I have already put them in a tank with old bedding from the colony so they will smell somewhat like the colony I wish to introduce them into. I have also introduced the male to them with no problems (DUH!)

What I am wondering is when do I put them with the females in the colony? one female has a litter (almost 1 wk old) and the other looks like she should have popped days ago, so any time she'll have newborns.

I NEED these litters to grow to maturity, I don't want to bother the new mothers into killing thier litters because I put new females in.

What do you guys think, will they be ok, even with the small babies?? Or should I wait until the litters are older??