How much newborn clothes to buy?

I am due on September 30th and I am clueless about how much newborn clothes to buy? I have couple of newborn onesies , couple of onesies that are from 0-6 months, maybe 2 or 3 fleece outfits for a newborn and maybe 4 or 5 sleepers. This is my first child and I am unsure about how many outfits a day do they go through and how fast are they grow out of it. Moms please help!!!