[kipper6]

'Progesterone works in partnership with estrogen during a woman's menstrual cycle, preparing her for a possible pregnancy, and contributing to an increase in her breast size. Estrogen stimulates the growth of breast tissue while progesterone causes water retention' -
http://www.ehow.com/facts_5798630_progesterone-breast-growth.html

if water retention is what progesetrone does in breast, it would seem then the more water retained the more rounder/fuller the breast would become?

Hi! Your guess is as good as mine! :-) But I can give it a try with a progesterone cream I suppose. I 'm too scared to put hormones into my body, but on the outside I may try it out since I'll be localizing a cream to just the breasts. I'm also going to try to obtain my records from the time I had hormones tested to see if I was on the low side with progesterone. What I find interesting is my breasts get bigger when I get my period but not rounder, but they do feel firmer/sore. So that makes me think it's not a progesterone problem? Now, I have been on 3 different birth control pills: Yaz, Lo-Estrin FE, and a generic brand I do not remember which was comparable to Lo-Estrin. But they were all I think low doses of estrogen. I'm not certain about Yaz... I never saw a change in my breasts like many woman report from birth control and even my best friend had breast growth from birth control, so this makes me think that take low dose estrogen didn't do anything to affect my breasts, but if it had been a higher does of estrogen, perhaps breasts would have grown etc. Not sure if they would have become rounder though :/