Re: I know my storage bags aren't leaking!! I'm losing my mi
Welcome to the forum!
So, when you pump, are you pumping into the same brand of bottle that you're pouring the bags into at the end of the process? Often one brand of bottle will have different oz markings than another, and that could explain the apparent difference in volume. A good way to test this would be to pour 5 oz of water from your pump bottle into your feeding bottle, and see if this is all due to differences in the markings on the sides of the bottles.
If you're using the same brand of bottle all the way through, then here are some alternative possibilities to explain the loss of volume:
- When milk is freshly pumped, it's often a bit frothy. Once milk has been sitting for a while, the froth dissipates, making the volume look smaller.
- Pouring milk from bottle to bag to bottle probably leaves some milk clinging to the sides of the bottle/bag. It's generally not much, but it could be enough to be noticeable.
- Sublimation during freezer storage could cause the milk to lose some of its water volume. (Sublimation is the process by which a solid turns into a gas without passing through a liquid phase- like when dry ice turns into has without becoming liquid. Basically, it's freezer burn.)
When we talk about milk losing nutritional value during storage, we're not talking about a loss of volume. Instead, what we're talking about is a breakdown of some of the more fragile components of the milk. It is not known how much of a problem this problem is- it's more of a hypothetical than anything else! And lipase doesn't destroy your milk. It simply breaks down the milk fats into smaller components. This would actually be helpful if it was happening inside the baby's digestive system. But when it happens in storage, it can cause taste issues that make some babies unwilling to drink stored milk.
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