Thrush in babies can present as white spots on their tongues, gums, roofs of their mouth or inside their cheeks that don’t go away with gentle wiping, explains Keith, noting that it can also look like a white film on their lips. Lucas says another sign can be a persistent diaper rash that doesn’t go away with diaper cream use. “It’s very common for both Mom and baby to have thrush simultaneously,” Keith says. “If you notice these symptoms, you want to notify the baby’s medical provider so that they can receive treatment.” Babies are usually treated with antifungal drops or gels.