Changing of the Areolas (Nipples)
Besides a woman's breasts being tender and swollen early in the first trimester of pregnancy, a woman may notice changes to her areolas or nipples. New hormones running through your body may cause your nipples to become bigger and darker than they normally are.
As your breasts get bigger, your nipples naturally get bigger as well, to help keep the balanced look. The darkening of the nipples is caused by a temporary increase of...
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http://www.babiesonline.com/articles/pregnancy/changingofnipples.asp