Dear Marie, Didn't mean for it to sound like you hadn't done your homework - more of a suggestion to the newbies to invest in some good reference books. Lawrence (4th Ed.) speaks to this issue on page 619 "Changing flavors of stored milk" and is indexed under "milk-human-stored, flavor changes in". BAB has a very short reference on page 191 in the chapter on expressing/storing milk, but also references to pg. 619 in Lawrence. The BB discusses this on page 144 under "Lipase." Both Lawrence and the BB have nice charts outlining the effects of various storage techniques, including heat treatment, on the various constituents of breastmilk. Warmly, Sharon Knorr, BSMT, LLLL, IBCLC in Newark, New York (near Rochester) mailto:[log in to unmask] ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]