I am so bummed! I just had to throw away another frozen bag of BM because it tastes like vomit! This is the second time I've had to do this. Both bags were about 2 months old- so I thought I'd be well within the freezing time frame. The only thing I can think of is that it was probably in the fridge for a few days before I froze it- I usually try to use it fresh, but if it doesn't look like I will need it before the 5-8 day mark, I throw it in the freezer. Maybe that's the problem, that I didn't freeze right away? I was thinking maybe lipase, but I can keep milk in the fridge for days and it's fine, and all my other frozen stuff DS has taken no problem.