what is thrush of the mouth in babies
About Oral Thrush. Oral thrush is a very common infection in infants that causes irritation in and around a baby's mouth. It is caused by the overgrowth of a yeast (a type of fungus) called Candida albicans. Most people (including infants) naturally have Candida in their mouths and digestive tracts, which is considered normal growth. The amount of this fungus in the body is controlled by a healthy immune system and some good bacteria.