wow, never heard of that before lol
I'm not a breast expert or anything (although some women would say otherwise
) but unless you're born with large breast then there's not much you can do, naturally.
I think the only way to increase breast size naturally is to put on more weight, but then there's the weight problem. You could always try wearing padded bra's.
EDIT
A little more elaboration
Breast profile:
A ducts
B lobules
C dilated section of duct to hold milk
D nipple
E fat
F pectoralis major muscle
G chest wall/rib cage
Enlargement:
A normal duct cells
B basement membrane
C lumen (center of duct)
As you can see most of the breast is made up of fat. More fat = bigger breasts.
Source: breastcancer.org