Thrush occurs when there is an overgrowth of yeast in your baby's mouth. Candida is the yeast that usually lives in the mouth, intestines and genital area and thrives in warm, moist conditions. This yeast is usually kept in check by the intestinal flora, or healthy bacteria, that abound in our system. Sometimes, though, there is an overgrowth of it, and this is called thrush. White patches
