When is a fever in a baby an emergency?

The clearest rule: if a baby under three months old has a temperature of 38°C or higher, treat it as an emergency — go to the nearest emergency department or call 000 straight away. Very young babies can become seriously unwell quickly and don't show illness the way older children do, so a fever in this age group always needs urgent medical assessment, even if the baby otherwise seems okay. For older babies and children, seek urgent care if they are very drowsy or hard to wake, breathing fast or struggling to breathe, have a rash that doesn't fade when pressed, are not drinking or have very few wet nappies, have a fit (seizure), or just look very unwell to you. Trust your instinct — if you're worried, get them seen.

My older baby or toddler has a fever but seems okay — what should I do?

In children over three months who are otherwise well, fever itself is usually the body's normal response to a common, often viral, infection — and the number on the thermometer matters less than how the child looks and behaves. Keep them comfortable, offer plenty of fluids, and watch how they are over time. Paracetamol or ibuprofen can be used for discomfort if needed, following the dosing for their age and weight — but the goal is comfort, not chasing a 'normal' number. See a doctor if the fever persists, if they're getting worse rather than better, if they're not drinking, or if anything worries you. And the red-flag signs above always mean urgent care, whatever the temperature reads.

How do I know which vaccines my child is due for?

Australia has a National Immunisation Program schedule that sets out the free vaccines recommended at each age — at birth, then through infancy, childhood and the teenage years. The simplest way to stay on track is to follow that schedule with your GP, child health nurse or immunisation provider, and to check your child's record on the Australian Immunisation Register. If you've fallen behind — which happens — catch-up schedules exist, so it's worth asking rather than assuming it's too late.

Is it normal to have questions about vaccines?

Completely normal, and asking good questions is part of being a thoughtful parent — not a sign of being 'anti-vaccine.' Childhood immunisation is one of the most studied areas in medicine, and the recommended vaccines protect children from serious, sometimes life-threatening diseases. If you have specific concerns — about timing, side effects, your child's particular health situation, or catch-up — the best move is to write them down and talk them through with your GP or nurse, who can give you accurate, individual answers. Bringing clear questions makes that conversation far more useful.

What are the common side effects of childhood vaccines?

Most reactions are mild and short-lived — a sore or red spot where the needle went in, a mild fever, or being a bit unsettled for a day or two. These usually settle quickly and are far less serious than the diseases the vaccines prevent. Serious reactions are rare. If your child has a high fever, an unusual reaction, or anything that worries you after a vaccine, contact your GP — and use the emergency red-flag rules above if they become very unwell. Your immunisation provider can tell you what to expect and what to watch for with each vaccine.

Decision aid

Children's health — fever, vaccines and questions for your GP

By Dr HB Lo, FACRRM Reviewed 15 June 2026 5 min read

General information to help you prepare for your GP — not a diagnosis, not personal medical advice. It doesn't replace a consultation, and using it doesn't create a doctor–patient relationship.

Two of the most common worries in early parenthood are a fever and the vaccine schedule. Both are easier to handle with a clear head — and with one bright line drawn first.

The bright line: a fever in a very young baby is handled differently from a fever in an older child. If a baby under three months old has a fever of 38°C or higher, that is an emergency — go to your nearest emergency department or call 000. In older children, fever is usually the body fighting a common infection, and how the child looks and behaves matters more than the number.

This guide explains how to read a young child's fever and how to think about childhood vaccines. It's general information, not advice.

If your baby or child is seriously unwell, act now. A fever of 38°C or higher in a baby under three months old is an emergency — go to your nearest emergency department or call 000. At any age, call 000 or go to the emergency department for a child who is very drowsy or hard to wake, struggling to breathe, has a rash that doesn’t fade when you press a glass against it, has had a fit, or simply looks very unwell. If you are worried, get them seen — trust your instinct.

Draw the bright line first

Early parenthood comes with a lot of worry, and two of the most common are a child with a fever and the question of which vaccines are due. Both are far easier to handle with a clear head — and with one line drawn before anything else: a fever in a very young baby is not the same as a fever in an older child.

If a baby under three months old has a temperature of 38°C or higher, that is an emergency. Go straight to the nearest emergency department or call 000 — don’t wait it out, don’t give paracetamol and watch, as HealthDirect states plainly. Very young babies can become seriously unwell quickly and don’t show illness the way older children do, so a fever in this age group always needs urgent assessment, even if the baby otherwise seems fine. This guide explains the rest with that line firmly in place. None of it is personal advice; it’s here to help you act fast when it matters and prepare good questions otherwise.

Reading a fever in an older baby or child

In children over three months who are otherwise well, fever itself is usually the body’s normal response to a common — often viral — infection. The number on the thermometer matters less than how the child looks and behaves, per HealthDirect. A child who has a fever but is drinking, alert between grizzles and recognisably themselves is in a very different situation from one who is limp, won’t drink, or looks “wrong” to you.

The practical approach is comfort, not number-chasing: offer plenty of fluids, keep them comfortable, and use paracetamol or ibuprofen for discomfort if needed, following the dosing for their age and weight. The goal is a more comfortable child, not a “normal” reading. The infant fever urgency decision aid below helps you think through where your child sits and whether to seek care — but it does not replace seeing a doctor, and it never overrides the red-flag rules.

The red flags that mean urgent care — at any age

Whatever the temperature reads, some signs mean a child needs to be seen urgently. Call 000 or go to the emergency department if a child is:

very drowsy, floppy or hard to wake;
breathing fast, grunting or struggling to breathe;
showing a rash that doesn’t fade when you press a glass against it (a possible sign of meningococcal disease);
not drinking, or has very few wet nappies (a sign of dehydration);
having a fit (seizure); or
simply looking very unwell to you.

That last point is not a throwaway. A parent’s sense that something is seriously wrong is a genuine warning sign that clinicians take seriously. If you’re worried, get them seen.

Childhood vaccines: staying on track

Australia’s National Immunisation Program sets out the free vaccines recommended at each age — from birth through infancy, childhood and the teenage years. These vaccines protect children from serious, sometimes life-threatening diseases, and childhood immunisation is one of the most studied areas in all of medicine, as HealthDirect and the NHMRC set out.

The simplest way to stay on track is to follow the schedule with your GP, child health nurse or immunisation provider, and to keep an eye on your child’s record. If you’ve fallen behind — which happens often, and for all sorts of ordinary reasons — catch-up schedules exist, so it’s always worth asking rather than assuming it’s too late. The vaccine schedule tracker below helps you see what’s recommended at your child’s age and prepare to confirm it with your provider.

Having your vaccine questions answered well

Having questions about vaccines is normal, and asking them is part of being a thoughtful parent — not a sign of being “against” vaccines. The recommended childhood vaccines have a strong safety record, and most reactions are mild and short-lived: a sore spot, a mild fever, an unsettled day or two, far less serious than the diseases they prevent. Serious reactions are rare.

If you have specific concerns — about timing, side effects, your child’s particular health situation, or catching up — the best move is to write them down and talk them through with your GP or nurse, who can give you accurate, individual answers. The vaccine question generator below helps you turn a vague worry into clear, specific questions worth asking, so the conversation actually addresses what’s on your mind. The RACGP supports GPs in giving exactly this kind of individual advice.

The questions worth taking in

Is my child’s fever in the urgent category, or the watch-and-comfort category right now?
Which vaccines is my child due for, and are we up to date or do we need a catch-up?
What side effects should I expect after this vaccine, and what would mean I should call you?
Given my child’s particular health, is there anything specific I should know?

These are questions, not conclusions. The aim is to act quickly when it matters and to decide the rest with your GP or child health nurse.

What this is, and is not

This is general information to help you prepare for your GP — not a diagnosis, and not personal medical advice. It doesn’t replace urgent care for a sick child, and it never tells you to give, delay or skip any medicine or vaccine; those decisions are made with your own doctors. For trustworthy Australian background, see HealthDirect and the National Immunisation Program.

And again, the bright line: a fever of 38°C or higher in a baby under three months, or any of the red flags above, means 000 or the emergency department now.

Related on this site: the appointment preparation decision aid helps you get the most from a short consultation, and the pregnancy and birth decision aid covers the decisions that come just before this stage.

If you want an unhurried discussion of your child’s health and how to prepare for appointments, you can work with Dr Lo.

Author: Dr Hoe Bing Lo — AHPRA MED0001212640 · FACRRM. Fun Doctors Pty Ltd · ABN 83 404 436 330.

Tools to take to your GP

Each runs in your browser — nothing you enter is stored or sent anywhere. They help you prepare the questions and print a one-page summary to bring to your appointment. They don't diagnose or recommend a specific treatment.

Frequently asked questions

When is a fever in a baby an emergency?

The clearest rule: if a baby under three months old has a temperature of 38°C or higher, treat it as an emergency — go to the nearest emergency department or call 000 straight away. Very young babies can become seriously unwell quickly and don't show illness the way older children do, so a fever in this age group always needs urgent medical assessment, even if the baby otherwise seems okay. For older babies and children, seek urgent care if they are very drowsy or hard to wake, breathing fast or struggling to breathe, have a rash that doesn't fade when pressed, are not drinking or have very few wet nappies, have a fit (seizure), or just look very unwell to you. Trust your instinct — if you're worried, get them seen.
My older baby or toddler has a fever but seems okay — what should I do?

In children over three months who are otherwise well, fever itself is usually the body's normal response to a common, often viral, infection — and the number on the thermometer matters less than how the child looks and behaves. Keep them comfortable, offer plenty of fluids, and watch how they are over time. Paracetamol or ibuprofen can be used for discomfort if needed, following the dosing for their age and weight — but the goal is comfort, not chasing a 'normal' number. See a doctor if the fever persists, if they're getting worse rather than better, if they're not drinking, or if anything worries you. And the red-flag signs above always mean urgent care, whatever the temperature reads.
How do I know which vaccines my child is due for?

Australia has a National Immunisation Program schedule that sets out the free vaccines recommended at each age — at birth, then through infancy, childhood and the teenage years. The simplest way to stay on track is to follow that schedule with your GP, child health nurse or immunisation provider, and to check your child's record on the Australian Immunisation Register. If you've fallen behind — which happens — catch-up schedules exist, so it's worth asking rather than assuming it's too late.
Is it normal to have questions about vaccines?

Completely normal, and asking good questions is part of being a thoughtful parent — not a sign of being 'anti-vaccine.' Childhood immunisation is one of the most studied areas in medicine, and the recommended vaccines protect children from serious, sometimes life-threatening diseases. If you have specific concerns — about timing, side effects, your child's particular health situation, or catch-up — the best move is to write them down and talk them through with your GP or nurse, who can give you accurate, individual answers. Bringing clear questions makes that conversation far more useful.
What are the common side effects of childhood vaccines?

Most reactions are mild and short-lived — a sore or red spot where the needle went in, a mild fever, or being a bit unsettled for a day or two. These usually settle quickly and are far less serious than the diseases the vaccines prevent. Serious reactions are rare. If your child has a high fever, an unusual reaction, or anything that worries you after a vaccine, contact your GP — and use the emergency red-flag rules above if they become very unwell. Your immunisation provider can tell you what to expect and what to watch for with each vaccine.

Source quality

Sources grouped by evidence tier. Australian primary tier first; international where Australia is silent or lagging. How tiers work.

T1 AU primary 6 sources

If you want a thorough, unhurried work-up of your own — not a generic answer — you can work with Dr Lo.