Blue Lips or Skin in a Baby

When to get help

This one has no amber column. Call emergency services immediately — 999 in the UK, 112 or 999 in Ireland and across the EU, 911 in the US and Canada, 000 in Australia, 111 in New Zealand — if your baby's lips, tongue, gums or the inside of the mouth look blue, grey or unusually pale, or if the skin of the face or body looks blue, grey, ashen or mottled.

The NHS lists blue or grey lips, tongue or skin as a reason to call 999 or go to an emergency department, and says it can be a sign that not enough oxygen is reaching the blood. NICE guideline NG254 places cyanosis of the skin, lips or tongue in the high-risk column of its table for stratifying the risk of severe illness or death from sepsis in children under five, alongside a mottled or ashen appearance and a non-blanching rash. NICE NG143 lists pale, mottled, ashen or blue skin, lips or tongue as a red feature in a child with fever.

Call at once even if the colour has already come back. A baby who turned blue and then recovered still needs to be seen, because the cause has not gone anywhere.

Blue hands and feet are a different thing

Most parents who search this have seen dusky, bluish hands or feet on an otherwise happy baby. That pattern — blue extremities with a pink mouth and tongue — is common in the early weeks and in a cool room, because a young baby's circulation prioritises the core and the small vessels in the hands and feet narrow. It is not the sign the guidelines are describing.

The distinction clinicians use is central versus peripheral. Central means the warm, well-supplied parts: the lips, the tongue, the gums, the inside of the mouth, the skin of the trunk. Peripheral means hands, feet and the skin around the mouth in a cold baby. Blue in the centre is an emergency. Blue at the edges with a pink centre, a warm trunk and normal feeding is usually temperature, and is worth a mention at the next routine check rather than a night in an emergency department.

Cold hands and feet do carry weight in one specific context. NICE NG254 lists cold hands or feet as a moderate-to-high-risk criterion when sepsis is being considered, which is to say when the child is also unwell. Cold hands on a well, feeding, alert baby in a chilly room are not that.

Where to look on darker skin

Cyanosis is described in most older material as a blue tinge to the skin, which is written from the starting point of pale skin. On brown and black skin the change can be much harder to see, and looking only at the cheeks or the backs of the hands will miss it.

The NHS advice is to check the lips, the tongue, the gums, the palms and the soles, because those places show the change more reliably whatever the skin tone. Use natural light if you can. Turn the lower lip down and look at the wet inside surface. On darker skin the mouth may look greyish or ashen rather than blue, and the tongue is often the clearest single place to look.

What else to look at in the same minute

Colour rarely changes on its own. While you are dialling, check the breathing: is your baby grunting at the end of each breath out, pausing, or breathing 60 times a minute or more, all of which NICE NG254 treats as high risk in a baby under one? Check the responsiveness: does your baby wake, and stay awake? Is the cry weak, high-pitched or continuous? Those are also NG254 high-risk criteria.

Press a clear glass against any rash and look through it. A rash that does not fade under pressure, with a fever, is a reason to call 999 straight away rather than waiting for anything else to develop.

Things that look like blue but are not

A faint blue-grey shadow around the mouth in a very young baby, sometimes after a bath or a feed, with pink lips and a pink tongue, is a common and usually harmless pattern. Blue dye from food, a toy or a marker pen transfers to lips and tongue and will wipe or wash off. Bruising after a fall looks blue but is fixed in one place and tender.

None of these are worth an hour of internet reading in the moment. If you cannot tell the difference between staining and cyanosis by looking at the tongue in good light, treat it as cyanosis and make the call. Nobody in an emergency department will think less of you for it.

What to do while help is coming

Keep your baby with you and keep them calm; distress increases oxygen demand. Hold them upright or semi-upright rather than flat, loosen tight clothing around the chest and neck, and keep the room comfortably warm without wrapping them in extra layers. Do not give food or drink in case an anaesthetic is needed. Do not drive yourself if your baby is deteriorating — the ambulance crew can start treatment on the way, and you cannot watch a baby and the road at the same time.

If your baby stops breathing and is unresponsive, start infant resuscitation and put the phone on speaker so the call handler can talk you through it. If you have never learned it, the call handler will give you the steps in real time; that is exactly what they are trained for.

What happens next

Expect an oxygen saturation probe on a foot or hand within minutes of arrival, plus a temperature, a breathing rate, a heart rate and a look at the chest. Depending on what those show, the possibilities range widely: a chest infection, bronchiolitis, a severe episode of breath-holding, a heart condition that has not shown itself before, or sepsis. NICE flags that some pulse oximeters can overestimate oxygen levels, especially on dark skin and when the reading is borderline, so a normal number will not stop a good clinician from acting on what they can see.

You will not be sent home with a shrug. Blue is one of the few signs in paediatrics that everyone agrees to take at face value, and it is one of the clearest reasons to stop reading and start dialling.