Thrush Child



Thrush is caused by a fungus. There are many microorganisms that normally live in the mouth. When these organisms become imbalanced, the fungus can grow and cause thrush. The imbalance of organisms may be caused by a medical condition or medication.

Risk Factors

Factors that may increase your baby's chance of getting thrush include:

  • Contamination from caregivers
  • Contamination during breastfeeding
  • Birth complications, such as preterm birth , premature rupture of membranes , or perinatal asphyxia
  • Very low birth weight babies admitted to neonatal intensive care
  • Vaginal yeast infection in the mother at the time of birth

Factors that may increase your child's chance of getting thrush include:

  • Use of antibiotics
  • Health conditions that suppress the immune system, such as:
    • HIV infection
    • Cancer or medical treatments for cancer, such as chemotherapy
    • Congenital immune deficiencies
  • Prolonged illness
  • Conditions that cause a dry mouth
  • Use of medications that treat psychiatric conditions



Thrush may cause the following in infants:

  • Irritability
  • Decreased interest in feeding
  • White, lacy patches on the inside of the cheeks or tongue that don't come off when rubbed

Thrush may cause the following in children:

  • Sore mouth and throat
  • Difficulty swallowing
  • Differences in taste
  • White or red patches on the inside of the cheeks or tongue that may or may not come off when rubbed
  • Fissures or cracks in the mouth


You will be asked about your child's symptoms and medical history. A physical exam will be done, including an inspection of the mouth. Diagnosis can usually be done after physical exam. A sample of cells may be taken from the affected area. The sample will be examined under a microscope to confirm thrush or look for other infections.



The goal of treatment is to restore the normal balance of bacteria and yeast in the mouth. If any underlying conditions contribute to thrush, they will also be treated.

Treatments include:


In infants, antifungal medications may be a gel or a rinse that is swished around your baby's mouth. Systemic medications may be used if:

  • Your baby is at risk for developing a systemic infection
  • Your baby can't tolerate other treatments
  • Your baby doesn't respond to other treatments

Breastfeeding mothers of babies with thrush can use a topical antifungal medication on their nipples to reduce the baby's infection.

Antifungal medications for children may include oral tablets, rinses, or lozenges that dissolve in the mouth.

Proper Oral Hygiene

Oral hygiene practices that may aid in healing include:

  • Clean your baby's mouth with a clean, moist gauze pad as soon as baby teeth appear.
  • Have your child rinse his or her mouth with warm salt water.
  • Gently scrape patches off your child's mouth with a toothbrush.
  • Gently brush any newly appearing teeth with a child-size toothbrush and water.
  • Start to clean your baby’s teeth regularly as soon as they come in. Use an amount of fluoride toothpaste that is about the size of a grain of rice. Progress to an amount that is about the size of a pea by the time your child is 3 years of age. This will reduce the risk of your child swallowing it.
  • If your child has 2 teeth that touch, you can start to use dental floss.


To help reduce your child's chance of getting thrush, take these steps:

  • Maintain proper oral hygiene after treatment.
  • Thoroughly clean your baby's pacifier and toothbrush.
  • If your baby is prone to thrush and drinks from a bottle, use disposable nipples.
  • Avoid mouthwashes and mouth sprays. These can upset the normal balance of yeast and bacteria in the mouth.
  • If your child uses a corticosteroid inhaler, make sure they rinse their mouth thoroughly after each use.
  • If your child is at risk, ask your child's doctor about antifungal medication.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.