I am having similar issues. I have a 3 month old who weighs 11lbs 10oz and the lactation consultant told me to supplement with formula along with breast feeding. So feed as you normally would, then give her formula in a bottle after every feed. It sounds okay, but after reading a bit online I found that supplementing with formula can also decrease milk supply. The best thing you can do is to feed on demand and let your LO comfort suck even if they are done feeding. Also pump in between feeding sessions even if no milk comes out you are still stimulating your breasts and your body will get the cue to produce more milk. I also stopped taking oral contraceptives because I wasn't aware that progestin only pills can have the same affect as estrogen pills. I also started taking Fenugreek herbal supplements 2x a day. It seems to be helping with my milk supply. I think the fact that my LO sleeps through most of the night now she is not getting those extra 1-2 feedings at night so obviously her weight is slowing down. I go back on August 30th. I have not followed the LC advice about suppplementing with formula. My LO hates the taste of it..have you introduced formula to your EBF baby? She may not even accept the formula..you'd be surprised! Hang in there. you are not alone.