Thrush is a yeast infection that causes white patches in the mouth and on the tongue. Thrush is most common in babies and older adults, but it can occur at any age.
In babies, it is easy to mistake thrush for milk or formula. It looks like cottage cheese or milk curds. Don't try to wipe away these patches, because you can make them red and sore. Some babies with thrush can be cranky and do not want to eat. Read more about thrush and how it relates to your dental health.