My daughter is currently 4 months old and I recently pulled some frozen breast milk that is about 2 months old from my freezer. When it was almost all the way defrosted I smelled it and it smelled bad. More sour than soapy. I tasted it and it was horrible. All 3 bags I pulled were like that. I also noticed this smell and bad taste when my milk is in the fridge for more than 48 hours. At first I thought it was excess lipase. So yesterday I scaled my milk and then put it in the fridge to test. After 24 hours it not only smelled bad but also had some small chunks in it. I threw it out. So does this mean it is a chemical oxidation issue? I am following proper pumping and storage procedures. If it is chemical oxidation, is the milk bad for baby? She actually drank the bad smelling milk yesterday and seemed fine. I only gave it to her because I thought it was excess lipase and I know that is fine for the baby as long as she will drink it.
Also, do I need to drink distilled water or will filtered water be ok? There seems to be a lot of info on excess lipase but not chemical oxidation.