Oral thrush in babies: signs, treatment and feeding tips

Oral thrush is a fungal infection of the mouth caused by a yeast called Candida. It's common in babies, usually harmless and easy to treat. The main sign is creamy white patches on the tongue, gums, roof of the mouth, inside the cheeks or on the lips that don't come off when you gently wipe them. A white coating that rubs off easily is more likely to be milk.

Some babies with thrush feed less or keep coming off the breast because their mouth is sore, while many don't seem bothered at all. Treatment is an antifungal gel or drops, chosen with a pharmacist or GP, and if you're breastfeeding you'll usually both need treating so you don't pass it back and forth. This guide covers how to tell thrush from milk, feeding, treatment, nipple thrush, sterilising, and when to get help.

What does oral thrush look like in a baby?

The NHS oral thrush page says a baby with oral thrush has a white coating on the tongue that may turn yellow or grey and look like cottage cheese, and sometimes white spots elsewhere in the mouth. The NHS thrush and breastfeeding page lists:

• creamy white spots or patches on the tongue, gums, roof of the mouth or inside the cheeks that don't come off when gently wiped with a clean cloth
• a white film on the lips
• a baby who is unsettled when feeding
• in some babies, nappy rash that won't clear up.

Nemours KidsHealth adds that some babies have cracked skin at the corners of the mouth.

Why do babies get oral thrush?

Candida lives harmlessly in most people's mouths. nidirect in Northern Ireland says babies are more at risk because their immune systems haven't fully developed, especially babies born before 37 weeks, and that thrush can follow antibiotics, either the baby's or a breastfeeding parent's. Australia's Pregnancy, Birth and Baby service says babies can also pick it up during a vaginal birth.

A leaflet from Kingston and Richmond NHS Foundation Trust says about 1 in 7 babies get oral thrush at some point, that it's more common under 10 weeks, and that it's rarely caused by poor hygiene. KidsHealth says it's most common in babies younger than 6 months.

How can I tell thrush from milk on my baby's tongue?

Milk can leave a white coating on a baby's tongue too. The main difference is whether it wipes away.

To check, wash your hands, wrap a clean, damp cloth around your finger and gently wipe one patch. nidirect says a coating that rubs off easily is more likely to be milk than thrush. Don't scrub: Australia's Pregnancy, Birth and Baby says patches that bleed when wiped gently are a reason to see your doctor.

If you're not sure, the NHS suggests seeing a GP if your baby is under 4 months and has signs of thrush, and nidirect suggests a GP for any child under 2. A GP may take a swab if the diagnosis isn't clear.

Does oral thrush make feeding painful?

It can. nidirect says babies may not seem bothered by the patches, but if their mouth is sore they may be reluctant to feed or keep coming off the breast during feeds. KidsHealth says some babies don't feed well or are uncomfortable sucking, while many feel no pain or discomfort, and the NHS says babies with oral thrush may not want to feed.

What helps while treatment starts working:

1. Keep offering feeds. Australia's Pregnancy, Birth and Baby says you can keep breastfeeding as usual. Many families find shorter, more frequent feeds easier while the mouth is sore.
2. Watch wet nappies. They're the simplest sign your baby is getting enough. See dehydration signs.
3. Start treatment promptly. The Kingston leaflet says symptoms usually improve within 2 to 3 days of treatment.
4. Get help early if feeds drop. The Kingston leaflet says to get an urgent GP appointment or call the NHS helpline if your baby is taking less than half their usual feeds, or has passed urine fewer than 3 times in 24 hours.

If your baby is fussy at the breast for other reasons, latch and positioning may help, and bottle refusal covers babies who push the bottle away.

How is oral thrush in babies treated?

Use treatment only on the advice of a pharmacist or GP, and follow the label or their instructions for how much, how often and for how long. Don't give leftover medicine from another child or another time.

• Mild cases may settle. The Kingston leaflet says mild cases may last only a few days without treatment, and KidsHealth says some cases clear without treatment within a week or two. A health professional can tell you whether to treat.
• Antifungal gel or drops. Australia's Pregnancy, Birth and Baby says most cases clear quickly with treatment from the pharmacy, and a doctor can prescribe antifungal drops or gel. The AAP's Candida page says nystatin is often prescribed.
• Age matters. The NHS says the pharmacy mouth gel is suitable for babies over 4 months, and to see a GP for a baby under 4 months.

What should I know about miconazole oral gel?

Miconazole is the active ingredient in some thrush gels, and its leaflet has important limits. The UK patient leaflet for Daktarin Sugar Free 2% Oral Gel (revised August 2026) says:

• don't use it in babies under 4 months, because of the risk of choking
• check with a doctor first if your baby is 4 to 6 months old and was premature, or has slow development or problems swallowing
• place the gel at the front of the mouth, never at the back of the throat
• if you're breastfeeding, never put the gel on your nipple to treat your baby
• tell your doctor or pharmacist about other medicines, because miconazole interacts with several, including the blood thinner warfarin.

The UK medicines regulator (MHRA) has warned that miconazole, including the oral gel, can increase the effect of warfarin, and that anyone on warfarin should tell their doctor or pharmacist before using it, including products bought without a prescription. Product labels and age limits can differ between countries, so check the pack you're given and ask your pharmacist.

Giving the treatment

Wash your hands before and after, as Australia's Pregnancy, Birth and Baby and the Kingston leaflet advise. Australia's Pregnancy, Birth and Baby suggests putting gel carefully on the tongue and gums with a clean finger in young babies, rather than a spoon or dropper, which can be a choking risk. If drops come with their own applicator, use it as the pharmacist shows you.

Australia's Pregnancy, Birth and Baby says you should see an improvement within 1 to 2 days if you follow the packet instructions. The Kingston leaflet says the infection takes around 7 days to clear completely, and the AAP says most Candida infections get better within about 2 weeks. Keep going for as long as you've been told, even once the patches fade.

Can thrush pass between breastfeeding parent and baby?

Yes. The NHS says thrush spreads easily and that you and your baby can pass it back and forth while breastfeeding. That's why treating both of you matters.

Signs of nipple thrush

The NHS thrush and breastfeeding page lists burning nipple pain, especially after feeds; itchy or sensitive nipples; flaky or shiny skin that may look red on lighter skin, or darker brown, purple or grey on darker skin; white patches or tiny blisters; and loss of colour in the nipple or areola. The Royal Women's Hospital in Melbourne, Australia adds bright pink nipples and nipple damage, such as a crack, that is slow to heal.

Not every sore nipple is thrush

The NHS says to have your baby's latch checked first, because thrush may not be the cause of nipple pain. The Australian Breastfeeding Association says a doctor will check for conditions with similar symptoms, such as dermatitis or vasospasm, and that causes like tongue-tie should be ruled out. The Academy of Breastfeeding Medicine says there's no scientific evidence that yeast causes deep breast pain called "candida mastitis". See sore nipples and mastitis before assuming it's thrush.

Treat you both together

Australia's Pregnancy, Birth and Baby says that if your breastfed baby has oral thrush, both of you need treatment, even if only one of you shows symptoms. The Royal Women's Hospital in Australia says that if either of you has been diagnosed with thrush, you'll both need to be treated. The Kingston leaflet says a breastfeeding parent usually needs their own antifungal treatment to stop you reinfecting each other.

• Your treatment is separate. nidirect says nipple thrush is usually treated with an antifungal cream applied after every feed, with any left over wiped off before the next feed, and tablets may be used in severe cases. Your GP will choose what suits you.
• Keep breastfeeding. The NHS says to carry on if you can, or express if it's too painful.
• Keep nipples dry. The Royal Women's Hospital in Australia suggests changing breast pads often, and the Kingston leaflet suggests avoiding plastic-backed pads.

On stored milk, NHS pages differ: the NHS oral thrush page says not to freeze breast milk to use later while your baby has thrush, while the NHS breastfeeding page says there's no evidence stored milk causes reinfection. Ask your GP or midwife if you're unsure.

If breastfeeding is hard while you sort this out, call a breastfeeding helpline (the Australian Breastfeeding Association on 1800 686 268 in Australia, the National Breastfeeding Helpline on 0300 100 0212 in the UK).

How do I sterilise bottles and dummies when my baby has thrush?

Yeast can linger on anything that goes in your baby's mouth. The AAP says long-lasting thrush is sometimes linked to dummies or bottles that haven't been properly boiled. nidirect notes it isn't clear whether thrush can be prevented, but these steps are widely suggested:

1. Bottles and teats: sterilise after each use, as the NHS and Australia's Pregnancy, Birth and Baby advise. Bottle-feeding basics explains how.
2. Dummies: sterilise them regularly. The Royal Women's Hospital in Australia suggests cleaning teats and dummies thoroughly, boiling them for 5 minutes, and replacing them weekly if possible. The NHS suggests replacing teats and nipple shields weekly. See dummies.
3. Toys: wash and sterilise toys your baby mouths, as the NHS breastfeeding page suggests.
4. Breast pump parts: the Kingston leaflet suggests sterilising them. The Academy of Breastfeeding Medicine says sterilising pump parts or toys isn't recommended to "eradicate" yeast in breast pain, so ask your GP what's needed for your situation.
5. Laundry: wash bras, breast pads, bibs, muslins and towels on a hot wash, as the NHS advises, and use separate towels.
6. Hands: wash well after nappy changes and before and after giving treatment.

When to get help

These tiers follow the NHS urgent-help guide and the sources above. Where sources differ, we use the stricter tier.

Call your local emergency number (000 in Australia, 999 in the UK, 911 in the US) now if your baby:

• has had no wet nappy or wee for 12 hours
• is much sleepier than usual and not feeding, or is too sleepy to feed
• is floppy, hard to wake or can't be woken
• is under 3 months and has a temperature of 38°C (100.4°F) or higher
• is 3 to 6 months old and has a temperature of 39°C (102.2°F) or higher
• is struggling to breathe, or has blue, grey, pale or blotchy skin, lips or tongue
• has sunken eyes, cold hands or mottled skin, which Australia's RCH dehydration fact sheet lists as signs of severe dehydration

These come from the NHS urgent-help guide and the Royal Children's Hospital Melbourne in Australia.

Get medical help today (same-day GP, after-hours doctor or a health advice line (Pregnancy, Birth and Baby on 1800 882 436 in Australia, NHS 111 in the UK, your pediatrician's after-hours line in the US); go to the emergency department if you can't be seen) if your baby:

• is refusing feeds or feeding much less than usual; the Kingston leaflet says less than half their usual feeds needs an urgent appointment
• has fewer wet nappies than usual, or a very dry mouth and no tears; the RCH says a baby under 6 months with any sign of dehydration should see a doctor
• has difficulty swallowing
• has a fever or seems generally unwell (use the emergency tier above for the temperatures listed there)

Talk to your GP or child-health nurse soon if:

• your baby is under 4 months and has signs of thrush, before using any treatment
• your baby isn't improving within 48 hours of treatment, as Australia's Pregnancy, Birth and Baby advises
• the patches bleed when wiped gently, spread to the skin outside the mouth, or don't go away after treatment
• thrush keeps coming back; KidsHealth says this is especially worth raising if your baby is older than 9 months
• your baby has a nappy rash that won't clear (see nappy rash)
• you have nipple pain that hasn't improved, or your own treatment hasn't helped after 48 hours, as the Kingston leaflet suggests

What's worth noting down?

Jot down when you first saw the patches, a photo in good light, feeds and wet nappies for a day or two, and any antibiotics either of you has had. Note when treatment started and how things change. This helps your GP or pharmacist decide whether it's thrush, whether treatment is working, and whether you both need treating.