Milk is what cows feed their babies, in theory. If you’re anything like me, it’s been years since you’ve suckled on your mother’s breast. And even when you used to do that, if you did, I bet you never found yourself faced with the dilemma of whether you would rather drink milk from your mother or from a cow. Even if you grew up on a farm, even if you were breast-feeding in the barn, and even if you were old enough to make rational decisions (which I hope you weren’t), I doubt you thought, maybe that nipple dragging around in that hay is better!

Milk sales have declined sharply, perhaps because we aren’t all babies
Grist