Frozen bm tasting sour/acidic?

[zirca]

I froze and then rethawed to test one bag. Comparing its taste to milk that has been refrigerated from earlier that day (Fri), it has an acidic taste and a nasty aftertaste. The stuff from the fridge tastes sweet with a tiny hint of acid but is otherwise fine. What is wrong with it? Need to pump enough to be away from baby for 24 hours so would be much easier if I could freeze it!!

kellymom.com/bf/pumpingmoms/milkstorage/lipase-expressedmilk/

Try scalding it before freezing x

Have you tried your baby with the milk? Sometimes mine tastes quite sour to me but my baby takes it with no issues at all. If the milk is truly spoiled a baby will not drink it. My daughter has only ever refused on bottle and it did taste rank. I have found with my milk I have to freeze it within 48 hours or it tastes awful.