I found this...
Mouth with white spots: Epithelial pearls are found on the gum or hard palate and are about the size of a pinhead. They'll go away by 2 months. Thrush consists of white patches on the tongue and inner cheeks. It can be confused with milk or formula (which easily wipes off.) Call and talk to our phone nurse of you think your child may have thrush.
hmmmm.... Violet still has one...