Lifting the diaper to find a red, sore-looking bottom can tug at your heart — but diaper 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
Diaper rash usually happens when delicate skin is irritated by something in the diaper:
- Pee and poop sitting against the skin, especially in a wet or dirty diaper left on too long
- Friction from the diaper rubbing, particularly in hot weather or when baby is very active
- Wiping too hard, or wipes with fragrance or alcohol
- Diarrhea, new foods, or antibiotics, which can all make skin more sensitive
- Teething times, when poops 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 diaper rash
The same habits that prevent rash also help an existing one heal.
At every diaper change
- Change soon after a pee or poop — 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 diaper 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 diaper 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 diaper 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 doctor/nurse — may need an antifungal cream |
| Weepy, crusted, blistered, pus, or spreading | Possible bacterial infection | See doctor/nurse promptly |
| Red, scaly, also on scalp/face | Possible eczema or seborrhoea | Talk to your doctor/nurse |
When to see your doctor or pediatrician
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
Diaper 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 doctor or pediatrician 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 doctor or pediatrician about your individual baby.