How to take your baby’s temperature and reduce their fever

Baby Temperature

by Emily Fedorowycz |

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.

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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 digital thermometer to get the most fast and accurate reading.

  1. Hold your baby comfortably on your lap and put the thermometer under their armpit (always use the thermometer under the armpit for children under five years of age.

  2. Hold their arm close to their body to keep the thermometer in place for the recommended amount of time (usually 15 seconds). If you're using a digital thermometer it will probably beep.

  3. Check the display on the thermometer for the reading.

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.

If you follow the manufacturer's instructions on your thermometer, you should get an accurate reading. There are however some factors listed below that can slightly alter the reading:

  • If your baby is wrapped in a blanket or cuddling a hot water bottle

  • In a very warm room

  • If your baby has just taken a bath

  • If you have a very active baby or toddler

  • Wearing a lot of layers of clothes

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.’

How to lower a fever

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.

Give them plenty of fluids

Their fever could be a sign of dehydration so make sure they drink plenty of water and see if their temperature improves.

Don't worry about them eating

Your baby should feed or eat if they are hungry and this shouldn't worsen their symptoms.

Get medical advice

If you're not sure what is causing your child's temperature and their symptoms aren't getting any better, seek medical advice.

Medicine must-know

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.

  • 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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Tommee Tippee Digital 2-in-1 Thermometer
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Tommee Tippee Digital 2-in-1 Thermometer, £14.55, Amazon

Perfect for using under your little one's armpit, this easy-to-use thermometer is lightweight, waterproof and gentle on your baby's skin. 

Providing a clear and reliable reading in just eight seconds, it's a great addition to any family first aid kit.

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