My mom recently babysat for me, heated a bottle of expressed BM, and told me that it smelled like dish soap. Since I had been told this before and since my DD has a history of bottle refusal, I assumed it was a lipase issue, and I began working toward a good scalding routine. Well, we've been working on transitioning DD to a sippy cup, and I decided on a whim to place a small amount of BM in the cup instead of a sip of water. This milk was fresh from the day and COLD. She drank it like a champ, so I decided to save the rest of the milk that I hadn't poured into the cup in the fridge. I figured it would be a good test of how long my milk can go before beginning to smell. Well, three days later, it still smelled fine, and my DD was still interested. HOWEVER, as soon as I heated it, it smelled awful! But, it didn't smell like dish soap to me. Instead, it smelled like formula baby spit-up (sorry, that's the only parallel I can draw). So, what's going on here? Is this normal? Do all moms with excess lipase have milk that smells fine until heated? Could the lipase issue come and go? I'm not sure whether to even continue this scalding process, or just begin to thaw frozen milk and offer it to DD cold. Of course, maybe THAT will smell bad...haven't tested that theory yet. Any ideas here?