It’s true that even after you’ve properly stored your milk (and sometimes even before you store it) your breast milk can go sour. It may taste and/or smell sour, metallic or simply rancid. It is not a typical problem but it does happen occasionally: too much lipase. Lipase is an enzyme that breaks down fat. Fat however, it what makes breast milk taste good. Fat actually makes lots of foods taste good for that matter, but I’m getting off topic here. Essentially the lipase is “eating up” all the fat in mom’s breast milk and the result is sour tasting … Continue reading →