Oral Thrush (Oral Candidiasis)
Common yeast infection of the mouth in infants.
Primary risk age: Mostly young infants; also children using inhaled steroids or after antibiotics.
- Urgency
- Mild
- Typical age
- Mostly young infants; also children using inhaled steroids or after antibiotics.
- Body system
- Infectious & Parasitic
Typical course: Usually improves within a few days and clears within 1–2 weeks of antifungal treatment.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Common yeast infection of the mouth in infants.
Pathophysiology (Development Path)
Candida overgrows on the moist lining of the mouth, forming adherent white plaques; it is usually a nuisance rather than a serious infection in healthy infants.
Primary Causes & Etiology
Overgrowth of Candida yeast, favored by the immature infant immune system, antibiotics, or inhaled corticosteroids.
2. Symptom Continuum
- Early Onset Signs
White patches on the tongue, gums, or inner cheeks that, unlike milk, do not wipe away easily.
- Progressive Phase
More extensive white plaques, mild fussiness or reduced feeding, and sometimes a linked diaper yeast rash.
- Severe Indicators
Refusal to feed, dehydration, thrush in an unwell or immunocompromised child, or spread beyond the mouth needs prompt medical assessment.
3. Clinical Verification
Clinical diagnosis from the typical non-wipeable white plaques; swabs are rarely needed.
4. Care & Elements Plan
Primary Care Treatment Plan
A clinician-prescribed topical antifungal applied to the mouth clears most cases. Treating a breastfeeding mother’s nipples at the same time prevents back-and-forth reinfection.
Home Support Elements
Sterilize bottle nipples, pacifiers, and breast-pump parts; offer feeds patiently. Continue prescribed antifungal for the full course even after plaques clear.
Generic Active Ingredients (No Brands)
- Nystatin oral suspension (topical antifungal active ingredient)
- miconazole oral gel (alternative topical antifungal for older infants, used as directed)
- sterilization of feeding equipment (drug-free measure).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
See a doctor if feeding is poor, the baby is dehydrated, thrush keeps returning, the child is otherwise unwell, or it does not clear with treatment.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Sterilizing feeding equipment, rinsing the mouth after inhaled steroids, and treating maternal nipple thrush reduce recurrence.
Immunization Context
No vaccine is relevant to oral thrush.
7. Timelines & Outlook
Active Timeline
Usually improves within a few days and clears within 1–2 weeks of antifungal treatment.
Expected Prognosis
Excellent in healthy infants; clears readily with treatment.
Potential Untreated Complications
Feeding difficulty, linked diaper rash, and recurrence; serious spread mainly in immunocompromised children.
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