i find that mice do better if the mother has help( nanny) caring for her young. so basically the pregnant mom should NOT have to build the nest on her own so purchase another female mouse( the nanny)...
The female mouse is the one who takes care of the young, the male will not stay with her. She cared for them until they are three weeks old when they are weaned and ready to care for themselves.
Well, I have 2 baby white albino mice that are females. you can start by buying a big plastic tub, because in a cage with holes they will get out.Then buy mouse pellets at petCO. Buy them a little...