Why do the pads on a women's nipples get so big?

why do they get so big?Why do the pads on a women's nipples get so big?
The size of a women's nipples has many contributing factors.
Foremost of these is genetics, certain ethnic groups tend to have women with larger/flatter nipples.
Also the variables that may have occured during development, for example, if a woman takes birth control while breast devolopment occurs, it MAY result is large breasts, which may, in turn, include a larger nipple.
Larger breasts tend to result in a larger/flatter nipple do to streching, so diet, excercise, and even height can play a factor.
Breastfeeding at an early age may effect nipple size.
Age, and premature aging tend to make nipples larger, so things like smoking/drug abuse can cause nipple stretching/sagging.
Do you mean the aureoles?
I believe some have different sizes, it depends on genetics. females can look at there moms and just tell how theres is going to look.
if you suck them a lot or ejaculate on them this will cause them to get bigger