ASF's tend to have a female dominated social structure from what I've observed. When a colony first starts breeding if the females having sorted out whose Boss Lady of the group there can be a lot of hauling pinks around and some losses with nobody sure whose in charge. Once all the females are bred and producing (therefore almost constantly lactating) they will all take turns and feed each other's babies which tend to be communally nested.

You might also want to offer them a large hide. Something as simple and disposable as a large kleenex box, shoe box, etc. I buy the big long boxes of Capri Sun juice boxes for my youngest son's school lunch and they are quite heavy cardboard, making them excellent ASF hides (do cut out most of the bottom so you can lift the "hide" without trapping a ton of babies and a VERY ticked off momma ASF in there).