I just thawed a few bags from September for daycare for LO. It smells different than milk that has just has been in the refrigerator. I wouldn't say that it smells rancid... I can handle the smell but I wouldn't say it smells like the fresh milk either. Ugh I will be so upset if I have to throw all that milk away. Has this happened to any of you?
Re: Does your frozen breastmilk smell different?
https://kellymom.com/bf/pumpingmoms/milkstorage/lipase-expressedmilk/ Info on lipase.
If it smells sour/rancid after heating, somehow bacteria got into your pump and it's all spoiled. :'( If that's the case, you have to throw away EVERYTHING. This was my issue last time and I lost 150 oz of frozen milk. As far as cleaning your pump, I would contact the lactation consultant to make sure, but every plastic part has to be thrown away, your tubing has to be replaced, all the flanges, and stoppers, and membranes. You also have to replace all plastic bottle parts. I was told by the lc to throw and replace rather than scalding, because some bacteria are extremely resilient, and might survive home sterilization.
I ended up having to completely replace my pump because the membrane that creates suction inside my pump, as well as the arm that alternates the suction, broke while I was talking it off. It was awful!!! I pray that it's only a lipase issue for you, rather than the latter.
Baby Boy due October 2017
Me 28 DH 30
After 4+ years TTC