Just curious how many ounces your 3 month old baby drinks from a bottle (ETA in each bottle, not over the course of the day)...I have been consistently getting about 4oz, give or take half an oz, when I pump, and I'm wondering if that is enough for DD. She sometimes drains the bottles and sometimes leaves a half oz in there. I am starting to worry if my supply is not that great, since I have a friend whose 4 month old drinks like 8oz in a bottle.