Mild nipple pain can be normal in the first few days of breastfeeding, but ongoing or severe pain is usually caused by a poor latch, where the baby is not taking enough of the areola into the mouth, leading to friction and soreness; other causes can include engorgement, cracked nipples, or tongue-tie. To improve latch, ensure the baby’s mouth is wide open, lips flanged outward, chin touching the breast, and more areola visible above than below, with a deep, comfortable latch that doesn’t pinch. You should seek help from a lactation consultant if pain persists beyond the first week, worsens, causes nipple damage or bleeding, or if the baby is not feeding effectively, as early guidance can prevent complications and support successful breastfeeding.