Thermometers

Both give a reliable reading — it's really about how you'll use it. A digital thermometer is used in the armpit or mouth, and the NHS recommends the armpit with a digital thermometer for children under 5. A non-contact infrared thermometer reads from the forehead in seconds, which is handy for a sleeping child or frequent checks. Both of ours are UKCA/CE-marked clinical thermometers.

Follow your thermometer's instructions. For a young child, place a digital thermometer in the armpit and hold their arm gently against their body until it beeps. Readings can be thrown off if someone has just had a bath, been wrapped up warmly or had a hot drink — wait a few minutes first. With an infrared model, keep the forehead dry and hold it at the distance the instructions state.

Normal body temperature is around 36–37°C, though it varies a little from person to person and through the day. A temperature of 38°C or above is generally considered a high temperature (fever) in both adults and children. What matters as much as the number is how the person seems in themselves.

Call your GP or NHS 111 urgently if a baby under 3 months has a temperature of 38°C or above, or a baby of 3–6 months reaches 39°C or above. At any age, seek advice for a fever with a stiff neck, a rash that doesn't fade when pressed with a glass, light hurting the eyes, signs of dehydration, or a temperature lasting five days or more — or whenever you're worried.