I am returning back to work in a few days and I am trying to decide whether i should increase the amount my mother will be giving my little one since i will not be able to breast feed during the day. I usually 3times a day, and on demand if my son wants a little more than the bottle. He will "snack" on my breast or take it as an appetizer in between feedings. He does not completely empty them and i guess uses it to fill up.