I have noticed, after being on HRT for 18 months, that mine are starting to fill out a bit...the sides are getting a little rounder, more than the previous "flat" (or "cone-like") contour. I don't feel they're getting "taller", but they are growing outwards a bit. The first few months I could tell they were getting taller (ie, more protruding from the chest), but that seems to have stopped or slowed...most of the current itchiness associated with a growth cycle is on the outer curvature on both breasts.