For your self I would pack some comfortable clothes or a robe, underware, socks, slippers, pads, tooth brush, paste, shampoo, conditioner ( the hospital may provide these but I like to bring my own), if you are breast feeding you may want a pillow, breast pads, nursing bars...also don't forget your camera, and chargers!!
Firstly, you should find out what your maternity ward provides then go from there. I'd pack at least 3 sleepers and undershirts depending on your weather. Be sure to pack a pacifier if that's what you will be using to soothe baby. Bottles (if you are using) and diapers are sometimes provided by the ward so you should check. A couple of newborn hats, mitts, receiving blankets. A small blanket?