This can depend on the person some are some aren't.
Breast size varies greatly among individuals. There is no "normal" size for breasts, as they can range from small to large and everything in between. It is important to remember that all breast sizes are normal and natural.
Not normally
We can grow big breasts by doing sex with other boys because they suck our breasts.
BIG
normally after puberty and when your pregnant
Big.
as big as God intends
As Big as E
Big breasts are 'des gros seins' (familiar/slangish) in French.
Genetics.
It varies!
A cup
I guess that depends on how big your breasts are....?