There are a few ways babies can get oral thrush. Babies can also get a yeast diaper rash when their diaper area is too hot ...

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.

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.