ive noticed when thawing my milk that there are "chunks" floating in the milk, i was just letting it all settle and then squishing them through the bag, (thinking it was just the colder fat in the milk needing a little more help mixing back together). if i let it sit in the water longer there are less "chuncks" to squish helping me lean towards the fat not mixing idea, however, I was just reading another thread that mentioned tasting the milk to see if tasted bad... it started out sweet then had a yucky taste i can still taste about 10 minutes later. My daughter doesnt seem to mind it, at least not that i can tell. is it bad or just normal? i pump 3x a day (about 12-18 oz/day) at work and store in an insulated bag with 2 ice packs until i get home and put in the deep freeze and thaw using hot water in a large cup. i have tried it immediately after pumping and its very sweet with no sourness at all. help!!