: During these stages, nipples and areolas often become larger and darker. Breastfeeding can also change the texture or "stretch" of the nipple tissue, sometimes described as appearing more like a "bottle top".
: Nipples are highly sensitive erogenous zones packed with nerve endings. Arousal or cold temperatures can cause them to become erect, though they often "have a mind of their own" and may not always react predictably.
: Puberty, menstrual cycles, and menopause can lead to changes in sensitivity, size, and pigmentation.
As the body matures, several factors can alter the appearance of the breasts and nipples:
Nipples come in a wide range of shapes, sizes, and colors, all of which are considered normal.
: Like all skin, breast tissue loses some elasticity over time, which may cause the nipples to sit differently on the chest. Health and Sensitivity