For most pregnant women, the color of the nipples will change from light pink or light brown to dark brown or black after pregnancy, accompanied by changes in the enlargement and deepening of the color of the areola. The reason for this color change of nipples and areolas is mainly due to the increase of estrogen level in the body after pregnancy, resulting in deepening of local pigmentation, which is a normal physiological change during pregnancy. After the end of pregnancy, with the gradual recovery of sex hormone levels in the body, the coloring of the nipples and areolas will also change accordingly and gradually return to the state they were in during the non-pregnancy period. Pregnant women should pay attention to the intake of foods rich in vitamin C, such as kiwi, small tomatoes, grapes and other fresh fruits, which can effectively lighten the pigmentation of the skin during pregnancy, including the pigmentation of the nipples and areolas.