baby clothes question ?

Britt
Ok, I'm going crazy over what size clothes and how many outfits they will need the first few months. Newborn fits babies only up to 8 lbs, then it seems 0-3 mos fits 9-12 lbs, how quickly will baby grow? How many outfits will she need? And how the heck do you prepare when you don't know how much the baby will weigh?