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Fever in babies

8-minute read

You should go to the nearest hospital emergency department immediately if you have a baby under 3 months old with a fever above 38°C.

Key facts

  • A fever is a temperature above 38°Celsius (38°C).
  • While a fever may be a sign of illness, it is not usually harmful.
  • An infection with a virus is the most common cause of fever in children. Infections with bacteria can also cause fevers.
  • Using a thermometer is the best way to check your baby’s temperature.
  • If your baby is older than 3 months and seems well, you can treat a fever at home.

What is a fever?

A fever is a temperature above 38°Celsius (38°C). It is usually a sign of illness.

Most babies have an average body temperature of about 36.5°C to 38°C. A fever is when your baby’s body temperature rises above 38°C.

While a fever may be a sign of illness, it is not usually harmful.

What are the signs and symptoms of a fever?

Your baby or child may have a fever if they are:

  • hot to touch
  • unwell
  • crying and irritable
  • more sleepy than usual
  • not drinking or feeding as usual
  • vomiting
  • shivering

Sometimes children can have seizures when their temperature rises suddenly – these are called febrile convulsions or seizures.

What causes a fever?

A fever is the body’s response to an infection. An infection with a virus is the most common cause of fever in children. Infections with bacteria can also cause fevers.

Fever can also be a side effect of vaccinations.

Teething does not cause a fever.

How to take your baby’s temperature

Using a thermometer is the best way to check your baby’s temperature.

There are several different types of thermometers.

Digital probe thermometers can be used in your child's mouth (orally) or under their armpit (axillary). In babies younger than 3 months old, it’s best to use this type of thermometer under their arm.

Digital ear thermometers are quick and easy to use, but may give you less accurate readings if not used properly. These thermometers are recommended for children older than 3 months.

Digital temporal artery thermometers use infrared scanning of your child's forehead. These thermometers are easy to use but not always accurate.

Illustration of the different types of thermometers and where to use them.
Click here to view Types of thermometers.

Mercury thermometers are no longer recommended as they can break and poison your child. Fever strips and digital pacifier thermometers are also not recommended as they are not very accurate.

Your doctor, nurse or pharmacist can show you how to use your thermometer properly.

If your child’s forehead or skin feels very hot, it’s a good idea to use a thermometer to take their temperature accurately.

When to seek medical help

If your baby is under 3 months old and has a fever, you should take them to the hospital emergency department immediately, even if they are not showing any other signs of being sick.

If your baby is 3 to 12 months old, a fever might be a sign of illness, so see a doctor for medical advice.

If your baby is over 12 months old, see a doctor if they have a fever and:

  • have trouble breathing
  • become drowsy
  • don’t want to drink and aren’t weeing enough
  • vomit repeatedly or have frequent episodes of diarrhoea
  • display signs of a stiff neck, persistent headache or light hurting their eyes
  • don’t improve in 48 hours
  • are in pain

If you’re worried or not sure what to do, phone Pregnancy Birth and Baby on 1800 882 436 at any time to speak to a maternal child health nurse.

Fever in babies and children

Find out what to do if your baby or child has a fever.

Treating a fever at home

If your baby is older than 3 months and seems well, you can treat a fever at home.

You may want to use the Symptom Checker.

CHECK YOUR SYMPTOMS — Use the Symptom Checker and find out if you need to seek medical help.

Feeding and fluids

For breastfed babies younger than 6 months, offer extra breast feeds.

For formula-fed babies younger than 6 months, offer the usual amount of formula.

For babies older than 6 months, continue breast feeding or bottle-feeding. You should also offer frequent, small drinks of water or oral rehydration solutions. You can buy oral rehydration solutions from the pharmacy or supermarket.

Don’t worry if your child doesn’t feel like eating (but do worry if they’re not drinking).

Self-care measures

Dress your baby so that they are not too hot or cold. For children who are shivering, you can add a layer of clothing or a blanket until they stop shivering.

You can try cooling your baby down by wiping your baby’s forehead with a sponge or face washer soaked in slightly warm water.

Cold baths and showers are not recommended for babies and children with a fever.

Medicines

If your baby has a fever and they are miserable, you can give paracetamol for comfort. Make sure to follow the correct dose on the package.

Babies older than 3 months can also have ibuprofen for fever.

Speak to a maternal child health nurse

Call Pregnancy, Birth and Baby to speak to a maternal child health nurse on 1800 882 436 or video call. Available 7am to midnight (AET), 7 days a week.

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: October 2022


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Need more information?

Fever - MyDr.com.au

A fever is when the body temperature rises above normal. Find out about taking a temperature, how to treat a fever, and when to see your doctor.

Read more on myDr website

Fever | Sydney Children's Hospitals Network

What is a fever? Your child’s normal body temperature can vary depending on both their age and the time of day

Read more on Sydney Children's Hospitals Network website

Fever - Better Health Channel

A mild fever up to 39?C can actually help the immune system to get rid of an infection.

Read more on Better Health Channel website

Fever and high temperature in children | Raising Children Network

If your child’s temperature is higher than 38°C, it’s probably a fever. A fever is a sign of illness. Here’s what to do when your child has a fever.

Read more on raisingchildren.net.au website

Fever in babies and children - infographic

Find out what to do if your child has a fever, when to see a doctor and how you can treat your child’s fever at home.

Read more on Pregnancy, Birth & Baby website

Common reactions | Sharing Knowledge about Immunisation | SKAI

It is not unusual for babies and children to have a mild fever for a day or two after vaccination

Read more on National Centre for Immunisation Research and Surveillance (NCIRS) website

Types of thermometers

There are several different types of thermometers you can use to check your baby’s temperature.

Read more on Pregnancy, Birth & Baby website

Dressing baby in the right clothes for bed | Raising Children Network

Babies sleep well when they’re not too hot or cold. Dress babies in enough clothes to keep them warm without blankets, or try a safe infant sleeping bag.

Read more on raisingchildren.net.au website

How much bedding does baby need? | Red Nose Australia

Safe bedding in both summer and winter months

Read more on Red Nose website

Roseola infantum: babies and children | Raising Children Network

Roseola infantum is a viral infection in babies and children. Symptoms include fever and rash. It mostly clears by itself, but see a GP if you’re worried.

Read more on raisingchildren.net.au website

Call us and speak to a Maternal Child Health Nurse for personal advice and guidance.

Need further advice or guidance from our maternal child health nurses?

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