Postby NomadOfTheHills » Thu Nov 15, 2007 4:37 pm
That's the thing though, the breasts themselves are just adipose tissue, milk is not stored in the breast, it is produced and secreted as a result of suckling.
There is one theory that states that breasts evolved to prevent suffocating infants on a flat chest, as our jaws became flatter, breasts got bigger.
I'm not so sure of this theory, as if this were the case, breasts would swell during pregnancy, like they do, but in every other ape/primate, swelling is only present during the time the young suckles, and once weaned, the "breast" disappears.