[cunard-n]

wouldn't women who were very fertile be able to become pregnant while lactating? Such women would appear to have permanent breasts because they were always pregnant or lactating, thus signalling their fertility continuously and in that way having what appeared to be permanent breasts and permanent fertility? That would be very tiring for those women, but it would give them the advantage of being demonstrably able to become pregnant.Perhaps the bumps evolved as a leveler of the playing field, as it were...