This is a typical Mat setup here (just cleaned Alana's cage). Fleece but folded over on one end so I can put YN there to encourage mom to poop there. Foam chews only, no wood chews, but most of the time Mom nurses, eats, nurses, licks butts, and sleeps. Once the babies are a bit more mobile (they are only 4 days old right now) I will tie up the ramp until they are steadier. By then I should be able to move them into a bigger cage (R-680).
Mom gets out for 20 mins at a time during the first week, then more later on. I usually move them to aspen, or a real bedding once they have a fur coat to protect that sensitive skin.
I socialize practically from day 1.