Confused!!

chryssi.chatel

i have a 1 month old that is constantly hungry.  about 2.5 weeks ago, my milk production stopped completely in one breast.  i've been supplimenting with formula, but i'm confused as to how much she should be eating.  i hear that she's supposed to eat 2.5 oz each session.  but when we're feeding she wants to polish off a 4 oz bottle.  when i read the forumal can, it says 2-4 oz.  she's not overweight since she's only in the 50% for weight for her age.  what should she be eating?