Fevers are also known as a high temperature. Fevers are common in children. Fever by itself does not tell you whether your child is seriously sick. Even an ordinary cold can cause a high fever.
- A viral infection (such as a cold) is usually the cause of a fever in a child.
- If your child looks unwell and you are worried, take them to a doctor whether they have a fever or not.
- If your child has already seen a doctor but they are getting worse, go back to your doctor.
|If your baby with a fever is under 3 months old, you should always see a doctor.
See below: Do I need to worry more about my young baby with a fever?
What is fever?
Your child's normal body temperature is around 37ºC.
- Mild fever: Your child has a mild fever if their temperature is higher than 38ºC.
- High fever: A high fever usually means more than 39ºC.
Fever by itself does not tell you whether your child is seriously sick. If your child is miserable and seems unwell, and feels hot, you can use a thermometer to take their temperature if you want to. See Thermometers - how to use them. It is not really necessary to do this if your child seems well. The number on the thermometer cannot tell you what is causing the fever or how sick your child is.
What causes fever in children?
The most common cause of a fever in a child is a viral infection. A bacterial infection is a less common but more serious cause.
The body's natural reaction to infection with a virus or bacteria is to raise the temperature inside the body. This helps to kill the infection. Other causes of high body temperature include:
- immunisation – this usually causes only mild fever
- wrapping a baby in too many warm layers of clothing or bedding.
Will a fever harm my child?
Fever is a normal way for a child to fight an infection. Being hot may make your child feel unhappy or uncomfortable, but the high temperature is very unlikely to cause any long-term problems. Some children have seizures when they have fevers. These look very worrying, but even these febrile seizures are very unlikely to cause long-term problems. Read more about febrile seizures.
When should I seek help for my unwell child?
If you are worried about your child, whether or not there is a fever, you should take them to see a doctor.
If your child has already seen a doctor but they are getting worse, go back to your doctor.
Call Healthline on 0800 611 116 if you are unsure what you should do.
When should I phone 111?
|Phone 111 within New Zealand and ask for urgent medical help if your child:|
When should I see a doctor urgently?
|You should see a doctor urgently if your child with a fever:|
When should I see a doctor?
|You should see a doctor if your child with a fever:|
When is it OK to look after my child at home?
|You can look after your child with a fever at home if they:|
Is there anything I need to tell my doctor?
- has been overseas in the last few weeks
- has been around someone who is unwell.
Do I need to worry more about my young baby with a fever?
Young babies (less than 3 months old) need a different and more cautious approach:
- If they have a fever, make sure to go to your doctor.
- If you are worried about them, take them to your doctor even if they do not have a fever.
- Some babies may have an unstable temperature with an infection – they may be colder than normal – in a sick infant this is a worrying sign and is a reason to see a doctor urgently.
- Babies get fevers for the same reasons as older children, but they are not as good at fighting off infections.
You need to keep your baby warm but they can get too hot if you wrap them in too many layers when they are in a warm place. A good guide is to dress your baby in one more layer than you are comfortable wearing in the same environment.
Remember: Always take your baby to a doctor if they have a fever and are less than 3 months old.
How do I treat a fever in my child?
If your child has a fever but is content eating, drinking and playing, you do not need to do anything. Remember the fever is helping your child fight infection.
If your child is not comfortable, you can:
- encourage them to rest
- encourage them to drink lots of fluids, especially water – little and often is best
- if they are hungry offer small healthy meals
- make sure their room temperature is comfortable and steady (not too hot or too cold)
- use a cool cloth to wash their face, hands and neck
- keep your child in lightweight clothing and bedding, such as a singlet and pants covered by a sheet
- change the bed linen and clothing regularly
- check your child during the night
- take them to the doctor if they don't seem to improve or you’re at all worried.
- use any rapid cooling methods that make your child shiver
- use hot water bottles or electric blankets.
If your child is happy, and they are not unwell, you do not need to do anything more. You do not need to treat the fever with a medicine.
If your child is miserable because of the fever, you can give paracetamol to make them more comfortable. You must follow the dosage instructions on the bottle. It is dangerous to give more than the recommended dose. Read more about paracetamol in children.
You don't need to give babies and children paracetamol before or after immunisation. There is some evidence that paracetamol may reduce the effectiveness of childhood immunisations.
If your doctor gives your child ibuprofen, use it only if your child with a fever is miserable.
Don't give your child cold and flu medicines.
Never give your child aspirin as this may increase the risk of Reye syndrome, which is a rare and serious illness.
Content courtesy of KidsHealth NZ which has been created by a partnership between the Paediatric Society of New Zealand (PSNZ) and the Starship Foundation, supported and funded by the Ministry of Health.