I'm somehow magically losing an ounce of milk between what I pump and what ends up in the bottle to feed my baby. Is this common?
I pump into Medela bottles at work, which I then pour into bags at home, and mark the ounces that were measured on the Medela bottles. The caregiver is then pouring the bagged milk into a Comotomo bottle to feed to baby.
My mom who watches baby once a week said to me last week "you wrote 6 ounces on your bags, but I only got out 5". I was stumped and we thought maybe the ounceage was different between the bottles. So I double checked this by pouring 4 ounces of water into a medela bottle and then pouring that into the Comotomo bottle - there was no change, they both reported 4 ounces.
But then just this week my caregiver reported the same thing. Am I really losing an entire ounce on the insides of the pump bottles and bags? I really don't want to pump directly into bags as it would end up wasting a lot of bags, since I currently pump 4 times a day (that'd be 8 bags) and I am able to consolidate all of the milk into only 2 bags that go to daycare.