Baby Rash: When to Worry and When to See a DoctorAustralian parent navigation guide
Important: This article provides general health-navigation information for Australian parents. It does not diagnose your baby's rash or replace assessment by a qualified health professional. If your baby appears seriously unwell or you believe the situation is an emergency, call Triple Zero (000).
You've noticed a rash on your baby.
Maybe it appeared suddenly during a nappy change. Maybe your baby has also had a temperature, runny nose or cough. Or perhaps they seem completely well - but the rash looks unusual enough that you're wondering whether somebody should see it.
Rashes are common in babies and can have many causes. Most are not serious, but a rash is only one part of the picture. How old your baby is, whether they have a fever, how they are breathing and feeding, how alert they are, and whether they seem to be getting worse can all affect how urgently they should be assessed.
Rather than trying to diagnose a baby rash from pictures online, this guide focuses on a more useful question: What should you do next?
If you are looking for information on Rash in older children see our guide - Rash in Children: When to Worry and When to See a Doctor
Baby rash: a quick navigation checklist
1. How old is your baby? Very young babies need a lower threshold for medical assessment, particularly if they have a fever.
2. How is your baby otherwise? Look beyond the rash. Are they alert and responding normally? Are they feeding? Are they having wet nappies? Is their breathing normal for them?
3. Is there a fever? A rash together with fever deserves more caution. A baby younger than 3 months with a temperature of 38°C or higher should be assessed urgently in an emergency department.
4. What is the rash doing? Is it rapidly spreading or changing? Does it look like bruising? Does it fade temporarily when you press firmly on it?
5. Is your baby getting better, staying the same or getting worse? A change in the overall direction of your baby's illness can be more useful than focusing on one symptom in isolation.
Related guide: Baby Fever: When Should You Take Your Child to Hospital?
If something about your baby's condition concerns you, seek assessment even if you cannot work out what the rash is.
When should you worry about a baby rash?
Some situations need urgent medical assessment. The purpose of the following section is not to help you diagnose the rash yourself, but to highlight situations where online comparison is not enough.
A rash that does not fade when pressed
One feature parents may be asked to check is whether a rash blanches - meaning that it temporarily becomes paler when pressure is applied.
A rash containing red or purple spots that do not fade under pressure can sometimes occur with serious illness. This does not mean every unusual-looking mark is meningococcal disease. It means this is not a rash to diagnose yourself from an online photograph.
If your baby appears seriously unwell or you are concerned about a non-blanching rash, seek urgent medical care.
Baby rash with fever
A baby rash with fever deserves particular attention. Age is especially important.
Baby under 3 months + temperature of 38°C or higher
Go to your nearest emergency department for urgent assessment. Do not wait for the rash to become worse before seeking care.
More detail: Baby Fever: When Should You Take Your Child to Hospital?
Older baby with rash and fever
Your baby's overall condition matters. Consider whether they are:
unusually sleepy, floppy or difficult to wake
breathing differently or struggling to breathe
feeding substantially less than usual
producing fewer wet nappies
repeatedly vomiting
unusually irritable or difficult to settle
becoming increasingly unwell
developing a rapidly changing or spreading rash
If breathing is part of your concern: Worried About Your Child's Breathing? When and Where to Seek Help in Australia
Don't assess the rash without assessing the baby
This is one of the most useful ways to think about a rash in babies.
Parents understandably focus on the skin: What colour is it? Is it raised? Could this be viral? Does it look like the picture I found online?
Those observations can be useful to the clinician examining your baby. But also ask: How is my baby?
A baby with a noticeable rash who is alert, feeding normally, breathing comfortably and behaving normally presents a very different situation from a baby with a similar-looking rash who is becoming sleepy, refusing feeds or struggling to breathe.
The rash doesn't need to look dramatic for the rest of your baby's condition to matter.
When a baby rash may be less urgent
Many baby rashes turn out to be caused by relatively minor conditions. Depending on the circumstances, clinicians may consider things such as viral illnesses, skin irritation, eczema, heat rash, nappy rash or other common skin conditions.
For example, nappy rash is extremely common. Medical review may be needed if it is not improving, is worsening, develops blisters or sores, or is accompanied by fever, a body rash or your baby appearing unwell.
However, trying to identify the exact rash isn't the purpose of this guide. If your baby otherwise seems well but the rash is persistent, spreading, worsening or simply concerns you, arrange an assessment with your GP or another appropriate healthcare service.
What about a viral rash in a baby?
Viruses are a common cause of rashes in children. But 'viral rash' should not automatically mean 'nothing to worry about.'
If your baby has already been assessed and you've been told the rash is likely viral, continue watching the whole baby, not just whether the rash disappears.
Seek further medical advice if your baby's condition changes, they become more unwell, the rash changes significantly, or new concerning symptoms develop.
If your instinct is, "This isn't how my baby was when we saw the doctor yesterday," that is useful information to give the next clinician.
Related guide: My Child Is Getting Worse but We Already Saw a GP: What To Do Next
Should I see a GP, urgent care or emergency department for a baby rash?
This is where navigating the Australian health system can become confusing.
For a detailed comparison of the different services see our guide - Should I Take My Child to Hospital, Urgent Care, GP or Virtual ED?
GP
A GP can be a sensible starting point when your baby otherwise appears well but you need the rash assessed - particularly if it is persistent, recurring or worsening. Your GP can examine the skin in person and consider the rash alongside your baby's medical history and other symptoms.
Medicare Urgent Care Clinic
If your baby needs assessment sooner than you can access your regular GP, a Medicare Urgent Care Clinic may be another option depending on your baby's symptoms and the services available locally. Check age eligibility before attending, because some services have restrictions for very young babies.
Virtual care
Virtual care can sometimes help parents decide what needs to happen next, particularly when they're uncertain about the appropriate level of care. Availability and eligibility differ around Australia, so check the service available in your state or territory.
See the Australian navigation guide: Should I Take My Child to Hospital, Urgent Care, GP or Virtual ED?
Emergency department
An emergency department is appropriate when there are signs of potentially serious illness or your baby requires urgent assessment. Call Triple Zero (000) for an ambulance in a life-threatening emergency.
You've already seen a doctor - but your baby's rash is getting worse
Perhaps you saw a GP yesterday. You were told it was probably viral. Or you attended hospital and were discharged home. Now the rash has changed - or perhaps the rash hasn't changed very much, but your baby has.
Being assessed once doesn't mean you can't seek medical care again. Illness evolves.
When you re-present, explain what has changed since the previous assessment. For example:
"Yesterday she was drinking almost normally. Today she's taking less than half her feeds."
"The rash was only on her tummy yesterday. It has now spread and she has developed a fever."
"He was alert when we were assessed. Tonight he is much sleepier and difficult to wake for feeds."
That gives the clinician more useful information than simply saying, 'The rash is worse.'
Related guide: When Should I Take My Child Back to Hospital? (Australia Guide)
If the first assessment was with a GP: My Child Is Getting Worse but We Already Saw a GP: What To Do Next
If your baby is already in hospital: What to Do If Your Child Is Getting Worse in Hospital
Take photos of the rash
If it is safe to do so, photographs can be useful because rashes can change significantly before a medical appointment. Take clear photographs in good lighting and record approximately when each photograph was taken.
You might also note:
when you first noticed the rash
where it started and whether it has spread
whether your baby has had a fever
recent illnesses
new medicines
changes in feeding
wet nappies
vomiting or diarrhoea
whether your baby's behaviour has changed
This isn't about diagnosing the rash yourself. It's about giving the healthcare professional a clearer picture of how the illness has progressed over time.
If the rash or illness has developed while your child is taking antibiotics: My Child Is Still Sick After Antibiotics: When Should I Go Back to the Doctor?
A baby rash is only one piece of information
One of the easiest traps when your baby develops a rash is spending an hour comparing it with photographs online.
But the most useful question often isn't, 'What rash does this look like?' It's, 'How is my baby, and what has changed?'
A rash that appears minor doesn't override significant changes in breathing, responsiveness, feeding or hydration. And if your baby has already been assessed but is becoming more unwell, seek further assessment.
Parents don't need to identify the diagnosis before asking for help.
Baby rash: the takeaway
When your baby develops a rash, consider age + fever + the rash + your baby's overall condition + whether things are changing.
A baby younger than three months with a temperature of 38°C or higher requires urgent emergency-department assessment. A non-blanching rash, difficulty breathing, marked drowsiness, seizures, pale, blotchy or blue skin, or other signs of serious illness also warrant urgent assessment.
For less urgent concerns, your GP or another appropriate health service can assess the rash. If your baby has already been seen but subsequently deteriorates, seek medical assessment again.
The goal isn't to become an expert at identifying baby rashes. It's to recognise when your baby needs another set of eyes.
