A white tongue after a feeding often prompts the question, “Could this be thrush?” Many times it is milk residue, but oral thrush, a Candida yeast infection, does happen in babies. Knowing a few clues helps you decide whether to keep watching or call the doctor.
Why It Happens
Thrush is an overgrowth of Candida yeast in the mouth. The AAP’s HealthyChildren describes it as common in infants and toddlers. Newborns can pick up Candida from the mother’s birth canal, and antibiotics or inhaled steroids can also set the stage. It tends to show up in the first months of life, while the immune system is still maturing.
Nationwide Children’s Hospital lists risk factors that include breastfeeding with an untreated yeast infection of the breast and using pump parts or bottle equipment that has not been sterilized well. It also notes that thrush is contagious and can pass to others.
How It Differs by Age
Thrush is most common in young infants, and when it is mild, many babies feed comfortably. White patches can appear on the tongue, lips, gums, roof of the mouth, and inner cheeks, and some babies have cracked skin at the corners of the mouth. When it hurts, a baby may be fussy or refuse the bottle or breast. In an older infant or toddler, it is worth thinking about recent antibiotics or inhaled steroids as a trigger. If thrush spreads to the esophagus, swallowing can become painful.
Care at Home
The main clue is whether the white coating wipes off. Milk residue usually sits on the surface of the tongue and tends to come off fairly easily when you gently wipe with a damp soft cloth after a feeding. The white patches of thrush generally do not wipe away, and forcing them can expose a red, tender base that may bleed. So rather than scrubbing to test it, a gentle try or two is enough; if the coating stays, have it checked.
If thrush is confirmed, doctors commonly prescribe a liquid antifungal medicine applied inside the mouth, although mild cases are sometimes watched without treatment. If a medicine is prescribed, using it for the full recommended time is important even if the mouth looks better. For breastfeeding families, the mother’s nipples can also carry yeast, so both mother and baby may be treated together. Pacifiers, bottle nipples, and pump parts should be washed and sterilized regularly.
Common Misunderstandings
First, that any white tongue means thrush. Milk residue also looks white. Second, that thrush is caused by poor hygiene. Birth and antibiotic use are common triggers that parents cannot control. Third, that the white film should be scraped off hard. Rough wiping can injure the lining of the mouth. Fourth, that once it clears it will never return. If bottle and pacifier care slips, it can come back.
Signs That Need Emergency Care Right Away
Go to the emergency room right away if your baby has a fever and seems limp, takes almost no feeds or fluids and makes far fewer wet diapers, struggles to breathe, or has white patches spreading into the throat with drooling and inability to swallow. A fever in a baby younger than 3 months also needs urgent evaluation. If it is not an emergency but the coating does not wipe off and lasts more than 1-2 weeks, pain is cutting down feeding, or it keeps coming back after treatment, contact your pediatrician. Consider talking with a pediatrician if you are unsure. This information reflects general guidance from the United States; if you live elsewhere, check with a local pediatrician. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.