When the baby well attached, the nipple goes into the soft part of the baby's mouth. This soft part is in the back of the baby's mouth and is called the soft palate. If the nipple goes into the front of the baby's mouth it will be pinched against the hard part of the baby's mouth. This is called the hard palate. When the nipple is in the front part of the baby's mouth, the nipples can crack and cause great pain. The baby can make cracked nipples when she or he sucks very hard. This strong sucking stretches and pulls the nipple. When the nipple rubs inside and against the skin and tongue of the baby's mouth, the nipple can get hurt. An infection can cause cracked nipples. A type of yeast can cause a skin infection on the nipple. This is called a Candida infection. The same infection can be in the baby's mouth. When the yeast infection is in the baby's mouth, it is called thrush. Thrush looks like clumps of milk stuck on the baby's tongue. But thrush cannot be wiped off the baby's tongue. If the thrush is rubbed off, this may hurt the baby. Thrush can happen if the baby has taken antibiotic medicine. 