Pain during breast-feeding is a sign of a problem and should not be ignored. Although sore or tender nipples are common during the first few days of breast-feeding, it should improve. Normal soreness or pain usually occurs for about a minute when the baby first latches on to the breast. Pain that is severe or continuous or that occurs again after it seemed to resolve is a sign of a problem and should be corrected. Other problems may include cracked, bleeding, or bruised nipples.
Sometimes sore nipples develop when the baby begins to suck harder because he or she is not getting milk quickly. This often is caused by: