I really like the sponge description. Another analogy I use is that it's like unpasteurized milk we used to get where the cream rises to the top if it sits undisturbed. I guess I'm showing my age. Did anyone hear Meredith Small interviewed on NPR awhile back? She said that in the hunter-gatherer feeding pattern (very frequent brief feeds), since the milk is never sitting undisturbed for very long, there is never a buildup of a large amount of foremilk, so this may be one explanation for why the babies don't get "colic". Makes sense to me. Diane Wiessinger (spelling?) had a similar post related to the short, frequent nursing pattern imposed by having an active toddler. Miriam