Baby thermometers UK: which type to buy

Which thermometer should you buy for a UK baby?

A digital thermometer used in the armpit. NHS pages on taking a baby’s temperature ask for that method in children under five. You do not need a smartphone gadget. Buy one you can read at 3 a.m. Skip mercury. A bath thermometer is a different product for water, not fever.

NHS, “How to take your baby’s temperature”, checked 13 August 2026: hold the arm against the body for as long as the maker says, usually about 15 seconds. We are not a clinic. A number without the rest of the baby is not a plan.

Source: NHS — How to take your baby’s temperature (checked 13 Aug 2026).

Are ear or forehead thermometers OK for babies?

NHS under-fives method is the armpit with a digital stick. Ear and forehead gadgets are sold as convenience. They are not the method those pages describe for young children. If a relative already bought one, still keep a digital underarm thermometer for the reading you might give 111. Do not mix two numbers and average them.

Healthier Together and NHS fever pages also describe armpit measurement for babies (checked 13 Aug 2026). We will not rank infrared brands. Skip a listing that says “hospital grade” without a method that matches NHS.

What temperature is a fever in a baby?

NHS treats about 38°C or above as a high temperature, and says a normal reading is about 36.4°C but can vary. Under three months, 38°C or you think they are hot is a 111 or urgent GP reason on those pages. We copy the threshold. We do not diagnose why it is high.

Source: NHS — High temperature (fever) in children (checked 13 Aug 2026).

Should a thermometer go in the hospital bag?

Optional. Wards have equipment. A digital stick is small if you want one at home afterwards. Do not pack a gadget tower. Notes, sleepsuits, nappies and a charger still outrank it. See the hospital bag list. Skip a forehead strip as the only device.

If you pack one, pack the digital underarm stick, not a Wi-Fi camera that claims to read skin temperature. That is a monitor fantasy, not NHS method.

Do you need a bath thermometer as well?

A bath thermometer checks water, not a fever. Elbow test plus a simple bath disc is enough for many parents. It does not replace the digital underarm stick. Skip two gadgets that do one job. See baby baths for the tub decision. Do not use a fever stick as your only water check either.

NHS washing pages cover how to bathe; they do not require a branded floating toy. A fever reading still uses the armpit device. Keep the jobs separate so a gift set cannot confuse them.

Which baby thermometers are worth comparing in the UK?

Compare a digital stick you will actually use in the armpit — pharmacy or marketplace. We have not calibrated them. Skip mercury and skip ear gadgets sold as the under-fives method. NHS pages stay free and un-monetised. Check the exact listing, pack size and seller before you buy.