I had 3 lactation consultants working with me at the hospital and afterwards. Oh and a home health nurse too. They all said I have this problem, something about the shape of the breasts and the space between them. They were reluctant to say I had a problem at first because they didn’t want it to sort of become a self-fulfilling prophecy. But it eventually became clear that my milk supply wasn’t enough. If you can fit a hand between both of your breasts, when they’re not in a bra just naturally there, then you may have the condition. It has something to do with a hormonal disruption during puberty that causes the breasts not to develop properly.