Dear Ruth and all, You asked about refrigerated/frozen breastmilk tasting soapy or sour. I recently had a couple of different moms who reported the same problem. They checked out: washing & rinsing procedures of the pumps and bottles and nipples, changing storage containers and making sure they were tightly capped, placing the milk to the rear of the freezer and scalding the milk first. What finally was discovered was that the freezers were not cold enough. When temp. was turned down, the milk no longer tasted or smelled sour. Best of luck, Janaki