I joked around with this girl about how I have one testicle bigger than the other. She fired back well that's how my breasts are. She claims one is a B, and the other is a C. I've never noticed anything but this girl is a friend and I don't exactly tend to see her bare breasts... but I figured I'd google it and picked up some interesting information.
So is it pretty common to be up to a cup off? I figured it had something to do with your growth rate too... granted, she is 18, but don't some girls finally END all puberty stages by like... 20?
Also, doesn't birth control help that? When my ex got on the pill she grew a cup size in a month...
Just figured I'd ask!