In the third month of pregnancy, if a pregnant woman develops hair on her stomach, it is mainly due to the change of hormone levels in the pregnant woman’s body after pregnancy. Androgen secretion increases, and at the same time the secretion of melanin also increases, which will lead to pigmentation hairy. There are many pregnant women after pregnancy, in addition to the small stomach will grow more sweat hair, but also appear skin color darkening, long spots, and the nose becomes bigger. The color of the areola, as well as the color of the straight line of the abdomen will become darker, these are some normal reactions during pregnancy. After the birth of the baby, the hormone level drops, these conditions and symptoms will slowly ease, most of them can return to the pre-pregnancy state, so do not need to deal with.