A fever is a body temperature above 38 degrees C. It is usually the body’s way to fight infection. For example viral infections (which do not respond to antibiotics) can often make a child’s temperature become high.
A fever can also caused by other things, such as immunisation or as part of an inflammatory reaction caused by some medical conditions.
The height of a temperature does not usually help to decide how unwell a child is (except in babies under 6 months old).
Physical signs of fever
Your child might experience one or more of the following:
feel hotter than usual to the touch on their forehead, back or tummy
feel sweaty, clammy or have red cheeks.
When to treat a child's fever with medicine
If your child has a high temperature and appears well, you may not need to give them medicine. This is because a fever is their body’s response to help fight the infection.
However, if your child is upset or distressed, you can give paracetamol (for example Calpol) or ibuprofen (for example Nurofen). This will help to bring their temperature down. These medicines will not treat the cause of the fever but they will help your child feel better.
Paracetamol and ibuprofen are safe to give together, but you may find it more effective to alternate them. Do not exceed the recommended dose. Read the instructions on the medication packet carefully.
How to measure your child's temperature
We do advise the following:
For babies and young children
Do use a digital thermometer under their arm. These can be bought from a pharmacy or supermarket.
For older childrena
Do use a digital thermometer placed under their arm or tongue, or a tympanic (in-ear) thermometer.
We do not advise For babies and young children
Do not use forehead scanning thermometers, which are less reliable.
Do not use in-ear (tympanic) thermometers which are difficult to use on children under 6 months of age because their ear canals are so small.
For older children
Do not use rectal thermometers (which go inside the bottom/anus).
Do not use old-style mercury thermometers.
What you can do if your child has fever
Do
Keep them away from nursery or school.
Monitor them carefully at home and seek advice from your GP if you are worried.
Give them plenty of fluids to drink.
Look for signs of dehydration such as passing less urine than normal, complaining of thirst, or dark, sunken eyes.
Give them food if they are hungry.
Check on them overnight.
Give them paracetamol or ibuprofen if they are distressed or unwell. Always follow the instructions on the packet and never exceed the dose recommended for a child of their age.
Do not
Undress them or sponge them down to cool them. This may cause them to shiver and make the fever worse.
Cover them up in too many clothes or bedclothes because they may overheat.
Give aspirin to children aged under 16 years of age.
Exceed the recommended doses for paracetamol or ibuprofen (read the medicine packaging carefully).
Give ibuprofen to children with asthma, unless they have taken it before and experienced no adverse reaction.
When to get help
Make a GP appointment or call 111 if your child:
is under 3 months of age and has a temperature above 38 degrees C, or they feel hot to touch
is 3-6 months of age and has a temperature above 39 degrees C, or they feel hot to touch
has other signs of illness, such as a rash, as well as a high temperature
has a high temperature that has lasted for more than 5 days
has a high temperature that does not come down with paracetamol or ibuprofen
is showing signs of dehydration such as passing less urine than normal, complaining of thirst, or has dark, sunken eyes.
Call 999 or go to your nearest Emergency Department (A&E) if your child:
has a fever that continues after you have followed the advice on this sheet
has a stiff neck
has a rash that does not fade when you press a glass firmly against it
is bothered by light
has a fit (seizure) for the first time (call 999 if they are still shaking after five minutes)
has unusually cold hands and feet
has pale, blotchy, blue or grey skin
has a weak or high-pitched cry (different to their normal cry)
is sleepy and hard to wake up, or finds it hard to stay awake
finds it hard to breathe and sucks their stomach in under their ribs
your baby has a soft spot on their head that curves outwards (know as the fontanelle).
