It is normal for women to develop a lot of sweat hair on their stomach after pregnancy. This is because after pregnancy, the hormone level in the body of pregnant women is significantly changed, and the change of hormone level will lead to the increase of melanin and hairiness in the body. Many pregnant women will have more sweat hair on their bellies and more sweat hair on their lips during pregnancy, along with darkening of the skin, spots, acne, and the darkening of the white line on the belly. These symptoms are more common during pregnancy and do not need to be treated during pregnancy. These symptoms will be relieved naturally once the hormone levels in the pregnant woman’s body start to drop after the baby is delivered.