hiya. I'm about to return to work after 5 months of freezing loads of breastmilk, however, after going through my supply i noticed that most of it smelled sour and had sort of white looking mold on top , and i must say tasted really disgusting, totally sour. Everything has been frozen in avent via cups with tops and even the stuff that is only 5 wks old is looking not nice. Would this be a lipase problem or something else. Have tried a couple of times to give a bottle to my lo before i noticed this problem and she will take it after refusing a couple of time, but not sure if that was the milk or the bottle she was objecting to. Obviously i don't wanna throw it all away, but I wouldn't drink it. Otherwise my freezer seems to be working ok . thanks appreciate any help.!!!