I've got nappies, lotions/powders, spare clothes (more than you think you need), blanket/wrap, wash cloth, breast pads, pads, cloth nappy to wipe up any big mess, tissues, bib, clean dummy x 2 (in easy to find pocket), baby wipes, zip lock bags for dirty clothes, nappy sacks, breastfeeding cape and a musical bunny that he seems to like.
If you bottle feed you'll need all the paraphenalia.