Mother and Baby

Baby Temperature

Baby Temperature

Understand how to take your baby’s temperature so you get the most accurate result.

Whether he’s looking warm, seems a bit grizzly or has been unwell, there are plenty of reasons why you might want to take your baby’s temperature.

Simple enough when you have a thermometer, right? Sure – but there are still things to keep in mind so you get the most accurate reading and can take the best course of action. Welcome to your baby temperature checklist.

Normal temperature ranges for a baby 

Different babies will have different base temperatures. In order for the body to function efficiently, the temperature must be within the normal range of 36.5 to 37.2 degrees.

Taking your baby’s temperature

If your child is shivering and is less responsive than usual, has flushed cheeks, feels sweaty or is hot to the touch, check what his core body temperature is with a thermometer.

If it is raised, retake his temperature repeatedly to see whether his symptoms are improving or worsening, and if any medicine you administer is having an effect. The reading will help you decide whether or not to call a doctor and, when you speak to a medical professional on the phone, they will want to know what your baby’s current temperature is.

Understanding and using a thermometer

A digital thermometer placed under your baby’s armpit is the most accurate way to measure temperature. If you’re using an ear thermometer, make sure it’s properly inserted to avoid incorrect readings.

Never place a thermometer in your baby’s mouth as he may injure himself by biting it.

Find your baby’s healthy temperature

Measure your baby's temperature when he is well and write it down so you are aware of what it should next time you think he may have a high temperature.

If your baby has a temperature of 38C or more, call your GP. Fever temperature starts at 37.5C.

‘If your child has a temperature of 39.5 or above, you should always take action to try to lower it,’ says Dr Elia Maalouf, a consultant paediatrician and neonatologist at the Portland Hospital in London, ‘because a very high body temperature can cause a febrile convulsion, a kind of fit when the child’s body becomes still, his arms and legs twitch and he may lose consciousness.’ 

Check your baby’s clothing layers

How much clothing is your baby wearing?

His high temperature could be a sign that he’s overdressed rather than ill, so remove a layer and wait 20 minutes to see if his temperature goes down.

How to lower a fever

If you do decide to take action to reduce a temperature, most mums turn to the medicine cabinet. ‘Giving your child paracetamol should always be the first treatment,’ advises Dr Elia. ‘For most babies and small children, that means Calpol.’ Paracetamol acts directly on the brain, both acting as a painkiller and affecting the temperature centres in the brain to lower a fever. ‘It can be used on its own or in combination with a non-steroidal anti-inflamatory drug, such as ibuprofen,’ explains Dr Elia. 

If your child’s fever and discomfort aren’t lessened by giving paracetamol and ibuprofen, don’t panic, but call your GP immediately or head to A&E.

Medicine must-know

  • If your baby is more than two months old and weighs at least 4kg (9lbs), you can give him infant paracetamol.
  • If he is over three months old and weighs 5kg (11lbs) or more, you can give him infant ibuprofen. 
  • Always read the manufacturer’s dosage instructions.
  • Never give a young child aspirin.


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Braun Age Precision Stick Thermometer, £14.99, 

Digital under-arm thermometer - ‘This is best for taking the temperature of a young child,’ says Dr Elia. Place it under the armpit for the specified length of time. 
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No-Contact Forehead Thermometer, £39.99,

​No-contact forehead thermometer - good for checking on a fever without disturbing your baby while he’s asleep, as it takes readings without touching the skin.
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Forehead Thermometer Strips, £4.99,

Strip thermometer - hold against your child’s forehead to get a reading. It’s less accurate than other types, however. Keep handy to carry out a quick check. 
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Braun Thermoscan Digital Ear Thermometer, £42.99,

​Ear thermometer - gives a reading a second after it’s placed inside your child’s ear. Useful if you have a wriggler on your hands. ‘Only use this on a baby aged three months or over,’ says Dr Elia. 

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