What is oral thrush in babies?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Oral thrush is a yeast infection that causes white patches on a baby's tongue, gums and inside the cheeks that do not wipe away easily. It is common in young babies and can be passed back and forth with a breastfeeding parent's nipples.

Key takeaways

  • Milk residue wipes off easily; thrush patches do not.
  • Babies with thrush may be unsettled or reluctant to feed.
  • It is treated with antifungal medicine.

What you can do

  • Sterilise bottles, teats and dummies regularly.
  • If breastfeeding, mention any nipple pain, so both of you can be treated.

When to talk to your doctor

See your doctor or pharmacist if you notice white patches in your baby's mouth, especially if your baby is under 4 months, is feeding poorly or the patches do not improve with treatment.

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