Quoting Brianna Eldridge-Cotteril:" Thats what I'm thinking, I've already got a carseat, and a bouncer and swing, it was given to me. I'mma ... [snip!] ... to me. I'mma go ahead and start stocking on diapers after a few more months, just cause their expensive, that and formula."
Make sure the carseat isn't expired. I was told not to use a hand me down carseat. Not only because they can be out of date, but you don't know if they've been in an accident or not. If they have, you have to have it inspected and a lot of times they will say you have to get a new one.
Definitely start stocking up on diapers and wipes now. Get newborn and size 1 just in case the baby is too big for newborn size diapers. And you can stock up on formula if you want but beware of its expiration dates too. Plus, you never know if your baby will like that formula or not. We went through 5 different formulas until we found one my son liked and that agreed with his tummy.