I store in bags of 200ml. My LO currently drinks 150ml, so I will mix 100ml of FBM with 50ml of EBM. So, 1 bag is good for 2 feeds.
If you're planning to store in exact amounts maybe you want to put in bags of 80ml then later slowly increasing the amount because their intake will also increase as they grow.
With anything frozen, I think it does lose a little of its nutritional value over time.
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