I couldn't seem to find this answer online? If I want to combine breast milk (or even just transfer BM from a bottle) that has been in the refrigerator to a freezer bag, is it okay to thaw it a bit under warm water? I ask, because the milk separates with the fatty part sticking to the bottle. But not sure if the refrigerating, thawing, and then freezing compromises the milk?

Also, I just read this thing on NOT shaking breast milk? Again, if you don't thaw and shake it, the fattier milk doesn't get combined?
http://www.bflrc.com/ljs/breastfeeding/shakenot.htm