[Kaytee]

You can't use butt paste, it will corrode the diaper. You can use aquaphore though. Other then that I don't know over the counter creams that are safe. Yes corn starch is fine. As far as diapers go, I use around 8 I would say. Some days less though. Other days more. lolI only have abround 14 diapers and I do laundry either every day or every other day depending. Just soak them in cold water for at least 30 minutes then wash in hot. Make sure you are using a good detergent though. Some swear by vinager, not sure how much though. We use Tide Free and Clear or Cheer free. Just nothing with dyes or perfumes in it. I guess it can ruin the diaper.
What type of diapers are you planning to use? I use mostly fitted and pockets. i love the pockets the most.

Oh with the cornstarch it is better to ue the kind you buy in the baking aile compared to the baby brand ones. The baby ones have fragrance in them. Just plain ol baking corn starch is safe on the diapers.