Definitely diapers–although I would caution against buying an excessive number of the newborn size. Only one of my children was ever able to wear that size, and only while she was still in the hospital. I gave away many newborn size diapers to an in-law who’d had a baby three days after I did! (On a side note, I thought I’d be smart the second time and stock up on size ones–and my son was too big to wear the damn things except while he was still in the hospital!)
Slings are great, especially for large babies, and/or if you’ve had a C-section.
DO NOT STINT on the the cost of the nasal suction bulb (AKA “snot-sucker” in our home)–pay what it costs to get a good one, because midnight sure isn’t the time for you to wish you had.
Stroller–not the umbrella type for newborns. When babies fall asleep in them their heads–and even upper bodies–can slump sideways or forward. I only made this mistake once! They are great for older babies, though.
Plenty of snacks and fluids for you, Mom. If you think you were a human vacuum while you were pregnant, just wait till you’re breastfeeding. Nothing edible was safe in my vicinity!
I second using recieving blankets as burp/vomit rags. Cloth diapers are great, too, but the blankets cover more ground. They also work well as diaper changing pads.
I loved the one piece pajamas–all my kids were winter babies and I’d put them in a onesie and the pj’s–arms, legs, and feet are covered all night long, even if they kick off the blanket.
Most definitely a good car seat. I don’t know if this works every time, but I once read that if you had an old carseat (from a still-existing company), you could call them and check to see if that model still met safety standards and that if it didn’t the company might send a new one for just the cost of shipping it to you. I told a friend about this when she was pregnant and had an old carseat someone had given her. You know what? It worked! They sent her a BRAND NEW (expensive-model) carseat and all she had to pay for was the shipping costs! So if your funds are really limited you might try it. The worst they can do is just say no!
Also, you might want to get dye-and-fragrance free detergent and fabric softener.
I also second the idea of a good VCR and favorite videos. I can tell you from experience, if you have to be up for long periods of time at night, you’ll be glad to have something to look at besides the crappy 2:00 am television lineup!