If for baby bag, wipes, diapers, extra outfit, a plastic bag (blow outs), bottle if you are nursing, water, snack for you, nursing cover.
Are you asking for the hospital? A couple of outfits, blankets, diapers and wipes, socks, hats and mitten.
For everyday use. Extra outfits, bottles, pacifier, diapers and wips, blanket, bady body wash, formula if not breastfeeding, water for formula, changing pad.
Look on this thread from april 12. The q and a is there already