Androgens are associated with inhibiting breast size, but too much may cause hormone related problems
As a note, breast reduction surgery can possibly make breast feeding no longer possible. It also leaves an unsightly scar.
Refs:
* Yen & Jaffe's Reproductive Endocrinology (Sixth Edition): The Breast http://www.sciencedirect.com/science/article/pii/B9781416049074000103
* Breast Size in Relation to Endogenous Hormone Levels, Body Constitution, and Oral Contraceptive Use in Healthy Nulligravid Women Aged 19-25 Years http://aje.oxfordjournals.org/content/145/7/571.long
As a note, breast reduction surgery can possibly make breast feeding no longer possible. It also leaves an unsightly scar.
Refs:
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