Sometimes mothers get soreness of nipples in the first week due to wrong positioning of the baby. She only sucks on nipple which causes the hurting. Another reason is because you introduce your baby to a pacifier or teat of the bottle in the first week, which affects the sucking and cause soreness of the nipples. It can also happen when the mother tried to take the baby away from the breast without breaking the suction. Do not worry if you get soreness. It usually settles down in a few days. But if it appears suddenly after 1 -2 weeks of delivery, it is because of fungal infection.