The '40' part of the measurements has nothing to do with the actual size of the breasts.
40 is the measurement in inches of the circumference of the chest directly under your breasts. Better known as 'back size'.
The 'C' is the cup size. Cup sizes range from anywhere between, AA, A, B, C, D, DD, E, EE, F, FF and so on and so fourth.
The cup size is worked out by the circumference of the chest at the widest point of your breasts, minus the 'back size'.
A difference of 1inch is an A cup. A difference of 2 inches B cup, 3 inches C cup and so on.
The average breast size of a UK woman is 36C, so to answer your question, 40C is a larger than average back size, but average cup size, so no not overly big, every 'body' is different and unique as are every pair of breasts.
We can grow big breasts by doing sex with other boys because they suck our breasts.
BIG
-8b-48a-40c
as big as God intends
Big.
As Big as E
Big breasts are 'des gros seins' (familiar/slangish) in French.
am 41 and male, i need to know how to make breasts milk i got men boobs am a 40c bra, if i take fenugreek will that help my boobs to grow, and i need to know what i can take asweel to make breasts milk and get my boobs firm
Genetics.
It varies!
A cup
I guess that depends on how big your breasts are....?