Can a thrush yeast infection hurt my baby if not treated?

Thrush: Oral thrush is painful, needs treatment with oral nystatin. If the immunity of baby is low, and there is spread to systemic infection, it can be serious.

Depends on variables: Many infants with a thin skim milk layer of thrush would do fine without treatment and remain asymptomatic.Some will develop enough irritation to the same mucous membranes inside the cheeks and lips that it will bleed occasionally and the kids will fuss during feedings.I routinely treat them all but realize that for many it is transient and may clear on its own.