I never said anything about fat relating to breastfeeding, I was saying men aren't attracted to breasts because "they look like butts" (if yours do, that's something to tell your doctor). Your breasts have several functions, breastfeeding is just one of them, "mimicking butts" is not.
Victoria secret models used to be put on a strict regime of vitimans and diet that increased the size of their breasts. Some gained a cup size even 2 cup sizes. I personally just went on birth control pills for an entirely separate reason and unintentionally gained a more womanly figure.
I’ve heard that the various amounts of subcutaneous fat within the breast is actually a direct relationship with the amount of fat and energy stored within both the breast and the remaining body and since humans are one of the few mammals whose breast aren’t only enlarged at labor but also puberty suggesting that humans are showing signs of obligate symbionts or that women are developing various levels of fat in preparation for famine and whatnot in order to feed other children if needed