Top 4 Ways On How To Take The Temperature Of A Baby

Having a baby that is unwell is one of the most stressful parts of parenting.

There is so much information available about what the best course of action is, how best to react and how unwell is really unwell? Before the panic sets in, let us take care of the first step – how to take your baby’s temperature.

So, you’ve noticed that your baby is not acting like themselves. They may be more unsettled than usual, sleeping more (or less!) and just generally… out of sorts. What next?

So, what are the main methods of temperature checking and the best thermometer for the job?

Table of Contents

Forehead Temperature Check with Infrared Thermometers

Infrared thermometers are used on the superficial temporal artery on the forehead, and the tympanic membrane in the ear. These methods are non-invasive and super-fast – you could probably do the former without your baby even noticing!

If you prefer a forehead thermometer, you’ll need to keep your baby still for a quick second, aim it at your baby’s forehead and press the button. Simple. As. That.

Infrared ear thermometers require a slightly higher level of skill – you will need to keep your baby still, put the thermometer into their ear canal and press the button. The result is usually quite fast, but you may require some help with keeping your baby still in order to get the job done.

Mouth, Armpit and Rectum Checking with Digital Thermometers

Digital thermometers can be used in the mouth, armpit, or rectum. These methods really require a certain skillset to obtain an accurate reading (and can come with some resistance!).

If you are taking a mouth temperature, you will need to put the thermometer under your baby’s tongue and keep their mouth closed until the thermometer beeps.

An armpit temperature requires you to put the thermometer under your baby’s arm and keep them still until it beeps.

Taking a rectal temperature can be uncomfortable for babies, but is the most accurate digital option. You can either place your baby across your lap on their stomach, or on their back with their legs pulled up.

Place a small amount of lubrication on the thermometer and your baby’s anus, turn the thermometer on and insert it gently into the rectum (no more than 2.5cm), then wait for the beep.

Forehead Temperature Checking with Strip & Pacifier Thermometers

Using a strip forehead thermometer on baby

Strip forehead thermometers require you to put the strip on your baby’s forehead and wait for it to work its magic and tell you what their temperature is.

Since their debut, however, they have shown to not be entirely accurate, as they take the temperature of the skin only.

Likewise, pacifier thermometers seem like a good idea if your baby already uses one, but they rely on your baby not letting in any air until the reading is complete.

Armpit Checking with Mercury Thermometers

Mercury thermometers are an older method of checking a baby’s temperature and are best used under the armpit. These are made of glass and contain mercury (which is quite toxic!). Needless to say, they must be used with extra caution and should only be handled by an adult!

Nowadays, there are more accurate and less dangerous options available.

Frequently Asked Questions

How high is “fever” high?

According to Health Direct, your baby’s temperature can range between 36.6ºC and 37.2ºC. You would normally consider your baby to have a fever if their temperature is above 38ºC, and has been for a sustained period – although it’s not always time to panic! You should keep an eye on any other symptoms, and your baby’s general demeanour, and seek medical advice if you’re unsure.

I think my baby has a temperature, but I don’t have a thermometer! What can I do?

Touching your baby’s forehead with the back of your hand, or even your lips, will give you a good indication as to whether they’re feeling warmer than usual. While this isn’t as accurate as using a thermometer, it can still give you a good idea when it comes to your baby’s temperature. Check also for signs of dehydration, and urine colour/output.

How often should I re-check if my baby has a fever?

As a parent, it’s normal to want to check your baby’s temperature every other second once you confirm that they have a fever (trust us, we know!). In all seriousness though, once an hour for a mild fever, and every half hour if it’s a higher grade fever (or if you notice an obvious decline in your baby’s demeanour).