Hi,
i'm not sure about your hospital, but when I had my son, they provided a lot. They gave me diapers, a breast pump, nipples to attach to the formula bottles (i ha all intentions in b-feeding, but when jaundice set in, he had to have formula, which was also provided.), they even gave him a pacifier. They gave me wipes to use, but they were dry, ihated them. They also gave a hat, shirt, and receiving blanket. They even had little net panties for me to wear so the blood didn't ruin mine. Here is a list of things I am packing this time:
for baby:
-onesies, socks, special blanket, cute little hat, gowns, outfit for hospital pictures, wet wipes (sensitive, fragrance free), lotion, bottle that I want her to use(playtex nurser) in case I can't b-feed and I need to pump for her
for mom:
-robe, gown, nursing bra, comfy clothes that are easy to nurse in (tanks, cotton shorts, yoga pants, as I hate wearing the hospital gowns, especially while visitors are there), socks, flip flops or slippers, hair tie, brush, toothbrush, toothpaste, body wash, shampoo, razor, deodorant, make-up, glasses or contacts (if you wear them), any other toiletry item you use (hospital will provide pads and antibacterial wash for you, but nothing else)
for dad: clothes and any toiletries he uses
general: camera (bring disposable as back up if you're using digital, our battery died before baby was ever born, thank goodness for a disposalbe), snacks (mainly for the nervous dad), lots of change for the hospital vending machines, call list of everyone you'd like to call, calling card if your hospital is long distance from family and friends
sorry this is so long, but there's a lot you'll need when it's your special day.