You start with 4 oz of water and add 2 scoops (0.25 oz each, added 0.5 total) to create a 4.5 oz bottle.
Baby leaves 2 oz in the bottle, did they have 2 oz or 2.5 oz?
I assumed they had 2 oz but never thought about the extra 0.5 oz… how does everyone else calculate consumption?