How accurate are your scoops

Hello, I Enfamil for my LO where 1scoop=2oz milk. My lo often has 3 oz so that’s 1.5 scoop. My half scoop is almost never the same amount. Like it isn’t wayyy off or anything but I just always estimate how much half scoop might be and put it in. How accurate are your scoops and how much does it really matter?