My breastmilk started going sour/tasting soapy a few months ago, when my girls were 11 months old. I recently went to my acupuncturist who thought maybe my system was too acidic and not alkaline enough. So, I started taking 2 tsp of baking soda daily - one int he mornign and one at night and all of a sudden my milk is no longer going bad fast. Just had to share, because it is such a relief! I've been doing the baking soda for about 3-4 days and I wouldn't suggest doing it much longer than that, but wow - it's totally different and so quickly.