@DrDara, thank you doctor, my baby has been using bottle before now because I had inverted nipple, the nipple is just coming out she just started sucking few weeks ago, she's close to 2month.I think d bottle is affecting coupled with position....

Try to get as much of the lower portion of the areola (the area around the nipple) in the baby’s mouth. Not just the nipple

Breastfeeding is not supposed to hurt. “When it does, it’s usually a signal that something is wrong and we need to find a way to fix it. I suspect that your nipple is paining you because you're not feeding the right way. When a baby is latched well, the nipple goes deep into baby’s mouth, right to the back. The baby’s tongue does most of the work in getting the milk out; if the nipple is not far enough back, the tongue will rub or press on the nipple and cause pain. Engorgement can make latching difficult. A baby who has been given bottles may use bottle-feeding techniques at the breast, leading to a poor or shallow latch. So make sure all part of the nipple goes directly into your baby's mouth while feeding. They are several factors that can lead to a pain your nipple. For instance, Mastitis is an inflammation of the breast due to poor drainage or an infection in the breast. When a plugged duct stops the milk from flowing, bacteria sometimes grow in the milk. Sometimes cracked nipples or untreated thrush allows bacteria to enter the breast. If this persists, see a lactation consultant.