Hi Erin, welcome to BN.
For some reason a gene (or two) didn't correctly activate your breast cluster development during puberty, perhaps prolactin was the dominant result causing tuberous breasts. It would be wise to have your hormones tested to detect for any deficiencies, then it's a matter of correcting them (balancing). Bio-identical (parabren free) progesterone cream has helped correct tuberous breasts, and fenugreek could also help. Having breast fed imo suggests the potential to develop again, reset the deformity (I hate the word) as it were (or is). I'm not a fan of BO so I won't comment.
During puberty breast development is stymied and the breasts fail to develop normally and fully. The exact cause of this is as yet unclear, however, a study in 2011 of the cells in the breasts of both males and females with tubular breasts suggested a genetic link in a disorder of collagen deposition.
-underlying genetic component promotes altered collagen fibre production, implying familial transmission of the pathology
Tuberous breast: Morphological study and overview of a borderline entity