going thru the newborn stage again here - LOTS of babygros/sleepsuits. in our case, it's winter, so she mostly uses footed sleepsuits. aillidh was born in summer, so she used more of the short-sleeved or sleeveless babygros or 'onesies'. you can't have enough of these things!
ditto bibs and muslin clothes. babies, even breastfed ones, can sick up or burp up some of their feeds.
a summer baby will go out more w/o needing a heavy jacket or snowsuit, so you may want more 'outfits'.
we have a fleece coverall for if she's going to be riding in the car, and a full on snowsuit for if she'll be outdoors for her walk.
no shoes just yet, we cover her feet w/socks.
towels! line your changing matt w/towels. i forgot, little babies often pee again as soon as you get their nappy off - change in temp does it.
we don't use wipes on roisin - i brew up chamomile tea, add a few drops of olive oil and a few drops of dr. bronner's baby mild soap, then put it in one of those lockable plastic storage containers - and dunk cotton wool in it to wipe her bum. i keep a stash of face towels - £2 for 10 in IKEA! - to hand to pat dry her bum before replacing her nappy.
if you don't own a filter coffee maker, get one! instant coffee doesn't cut it for those long night, IMO.