So, your baby is fussy and white patches have appeared on their tongue? It may be thrush, a yeast infection common in infants ...

They should not be used on a baby younger than four weeks old. Oral thrush is most commonly treated with a prescription oral antifungal drop that is applied to the sides of the infant's mouth.

Oral thrush is caused by the overgrowth of a yeast called Candida. More common in babies, it also affects people with a weakened immune system or as a side effect of corticosteroids and antibiotics.