Lifting the nappy to find a red, sore-looking bottom can tug at your heart — but nappy rash is one of the most common things babies get, and almost every little one has it at some stage, especially between 9 and 12 months. It usually isn't a sign you've done anything wrong, and most rashes settle quickly with simple care at home.
What causes it
Nappy rash usually happens when delicate skin is irritated by something in the nappy:
- Wee and poo sitting against the skin, especially in a wet or dirty nappy left on too long
- Friction from the nappy rubbing, particularly in hot weather or when baby is very active
- Wiping too hard, or wipes with fragrance or alcohol
- Diarrhoea, new foods, or antibiotics, which can all make skin more sensitive
- Teething times, when poos can become looser and more acidic
The classic irritant rash sits on the rounded, exposed areas — the bottom, genitals and thighs — and tends to spare the skin folds.
Preventing nappy rash
The same habits that prevent rash also help an existing one heal.
At every nappy change
- Change soon after a wee or poo — newborns often need 8 or more changes a day.
- Clean gently with warm water and cotton wool, or a fragrance-free, alcohol-free wipe.
- Pat (don't rub) the skin completely dry, including the folds.
- Smooth on a thick layer of barrier cream so the skin can't see it.
- Fasten the nappy snugly but not tightly, so air can still move.
- Change often. A dry bottom is the single best protection. Check regularly, even overnight if a rash is brewing.
- Use a barrier cream. A thick zinc oxide or petroleum-based (white soft paraffin) cream creates a waterproof layer. Apply it like icing a cake — generously — at every change.
- Give air time. Lay baby on a towel or waterproof mat with the nappy off for 10–15 minutes a day. Air and light help skin recover.
- Go fragrance-free. Skip scented wipes, bubble bath and harsh soaps while skin is sore.
Treating a flare-up
Most nappy rash clears in 3–4 days with diligent changing, gentle cleaning, barrier cream and air time. While it's healing:
- Change even more frequently than usual.
- Avoid wipes if they sting — warm water and cotton wool are kinder.
- Keep barrier cream thick and reapply every change.
- A lukewarm bath without soap can soothe; pat dry afterwards.
| Looks like | Often points to | Gentle first step |
|---|---|---|
| Red, on exposed skin, spares folds | Everyday irritant rash | Change often, barrier cream, air |
| Bright/beefy red, into the folds, small "satellite" spots | Possible thrush (yeast) | See GP/nurse — may need an antifungal cream |
| Weepy, crusted, blistered, pus, or spreading | Possible bacterial infection | See GP/nurse promptly |
| Red, scaly, also on scalp/face | Possible eczema or seborrhoea | Talk to your GP/nurse |
When to see your GP or child-health nurse
Please get your baby checked if the rash:
- Hasn't improved after 3–4 days of careful care, or is getting worse
- Is bright red, weepy, blistered, crusty, or has pus or open sores
- Reaches into the skin folds or has spots around the edges (possible thrush)
- Comes with a fever, your baby seems unwell, or is feeding poorly
Avoid using talcum powder (it can be breathed in) and don't use steroid or antifungal creams unless your doctor has recommended them — the right treatment depends on what's actually causing the rash.
A note for tired parents
Nappy rash can look alarming on a tiny bottom, but it's incredibly common and almost always temporary. Change often, protect with a barrier cream, let the air in, and you'll usually see it fading within a few days. If something feels off, or it's just not healing, a short visit to your GP or child-health nurse will set your mind at ease.
Guidance reflects Australia's Raising Children Network, the American Academy of Pediatrics (HealthyChildren.org) and the NHS, which broadly agree. This is general wellbeing information, not medical advice — please speak to your GP or child-health nurse about your individual baby.