I started to stock some more, and I made sure to store it properly, using Medela bags inside ziploc freezer bags. Again, when I went to use thawed milk, the same smell and taste were there. I am wondering if this is a problem specific to my milk. My freshly expressed milk does not have this smell or taste at all. Dear Susan, The problem with the frozen milk could either be a problem specific to your milk or specific to your freezer.
Some women have more lipase in their milk than others.
Lipase helps to break down the fat in the breastmilk. That is probably what is happening that is causing the milk to smell and taste bad. Many babies won't even care about the taste change. If you have an automatic defrost cycle, then this could also be a problem. Breastmilk should never be stored up against a freezer wall.