Karren, you are soooo right!
My breasts are a bit bigger than they were 4 years ago. I haven't done anything "intentional" to make them grow, nor have I been prescribed anything that has breast growth as a side effect.
I attribute it to wearing a properly fitted bra as often as I can, and ensuring I get all my breast tissue inside the cups. I'm of the opinion that the tissue has been "reformed," so to say.