In most cases, sore nipples are the result of poor attachment. If your baby is attached well, he or she has a lot of nipple in his or her mouth. The nipple itself then lies in the back of your baby’s mouth, against the soft palate. This does not hurt. If your baby is not well attached and only takes the nipple into his or her mouth, the nipple can rub the hard palate of your baby and get damaged. Sore nipples or cracked nipples can be the result. You can use a nipple balm (such as Bepanthen or Purelan). However, this will soften the nipples, which barely, or does not promote the healing.
Sometimes your nipples will be sore even though the baby is attached properly. If normal measures against sore nipples (proper attachment, changing position, dry nipples) aren’t helping, it could be a fungal infection.