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Old 06-23-2016, 01:50 PM
JR Brown JR Brown is offline
Join Date: Mar 2006
Location: Boston, MA
Posts: 1,039
I don't know if anyone has come up with any even remotely plausible theories on variation in breast size; there are plenty of WAGs but no evidence. My suspicion is that it's a factor of, on the one hand, the degree of overall fat accumulation, and, on the other, random variation; the same as responsible for height / shape / side differences in any other body part.

Originally Posted by md2000 View Post
Within a certain range, breast size has no impact on, say, ability to feed a child properly. So as long as breasts are not so big they cause medical issues, and not so small that the children starve, any size is acceptable in an evolutionary sense.
The adult female breast in humans is largely fat; the mammary glands and associated plumbing don't take up much space. Consequently, there is no "too small" to feed an infant; gorillas and chips nurse their young just fine with little breast development.