Sepsis in Children: Recognising Serious Illness and Knowing When to Act
Updated: 20 hours ago
A child with sepsis does not always look as people expect. There may be no dramatic collapse, no obvious rash and no single moment at which an ordinary childhood illness clearly becomes an emergency. The first indication may simply be that a child who normally chats, plays or responds readily has become unusually quiet. Their breathing may look different, they may stop feeding, or a parent may say that they are behaving in a way they have never seen before.
This uncertainty is one of the reasons sepsis in children can be so difficult to recognise. Fever, tiredness, vomiting and reduced appetite occur with many common childhood infections, most of which improve without serious complications. Sepsis is comparatively uncommon, but when it does develop, a child can deteriorate quickly and needs urgent treatment in hospital.
Parents, carers, teachers and first aiders are not expected to diagnose sepsis. That responsibility belongs to healthcare professionals who can assess the child, measure their observations and arrange the necessary investigations. The role of the person first noticing the illness is to recognise that the child may be seriously unwell and obtain appropriate medical help.
That distinction is central to this article. Recognising serious illness is not the same as diagnosing its cause. A first aider does not need to prove that a child has sepsis before calling for help, and waiting until every familiar symptom appears can create dangerous delay.
What Is Sepsis?
The NHS describes sepsis as a serious reaction to an infection that can become life-threatening. It develops when the body’s response to infection begins to damage its own tissues and organs.
Normally, the immune system responds to infection in a controlled way. It identifies the threat and produces a response intended to contain or destroy it. In sepsis, that response becomes harmful. Normal circulation and organ function may begin to fail, affecting systems including the lungs, brain, kidneys and heart.
If the condition progresses, blood pressure may fall and the organs may no longer receive the oxygen and nutrients they need. This severe disturbance of the circulation is known as septic shock.
Sepsis is not simply another word for an infection, nor does every infection lead to sepsis. A child can have a bacterial or viral illness, a temperature and several miserable days without becoming septic. What raises concern is the way the child is responding to the infection and whether essential functions such as breathing, circulation, consciousness and urine production appear to be affected.
The terminology can also cause confusion. The word “septicaemia” has traditionally been used to describe infection or presumed infection in the bloodstream, while “blood poisoning” is a common non-medical expression. Sepsis is the broader clinical condition in which the body’s response to an infection causes life-threatening organ dysfunction.
For the first aider, the practical message is much simpler than the underlying physiology: when a child looks seriously ill, is deteriorating or is displaying emergency warning signs, seek help promptly.
Why Sepsis Can Be Harder to Recognise in a Child
Children are not small adults. Their normal heart rate, breathing rate and behaviour change substantially with age, and babies cannot explain how they feel. A very young child may communicate serious illness through changes in feeding, crying, alertness or the number of wet nappies they produce.
Children may also compensate during the earlier stages of illness. Their heart and breathing rates can increase to help maintain oxygen delivery and circulation. This can allow them to appear relatively stable before their condition worsens.
The latest NICE guideline on suspected sepsis in people under 16 uses age-specific clinical criteria because a measurement that is normal for one age group may be abnormal for another. NICE expects healthcare professionals to consider a combination of behaviour, circulation, breathing, temperature, urine output and other clinical findings rather than relying upon one universal number.
That detailed clinical assessment is not something a parent, teacher or workplace first aider should try to reproduce. Counting a pulse or breathing rate can provide helpful information when the person is trained to do so, but it should not become an obstacle to obtaining help.
A more useful question outside a clinical setting is whether the child’s breathing, colour, responsiveness and behaviour are normal for them. If the answer is no, and particularly if the change is substantial or progressing, the child needs appropriate medical assessment.
Parents and regular carers have an important voice in that decision. They know how the child normally behaves when tired, upset or mildly unwell. A parent saying, “This is not how they usually are,” provides meaningful information, even when it is difficult to describe the difference precisely.
The Infections That Can Lead to Sepsis
Almost any infection can potentially trigger sepsis, although bacterial infections are the most common cause. The infection may begin in the lungs, urinary system, abdomen, skin, soft tissues or bloodstream. Sepsis may also develop in association with meningitis or another serious invasive infection.
Sometimes the original infection appears straightforward. A child may have symptoms resembling a chest infection, stomach bug or flu-like illness. At other times, the source is not immediately evident.
The apparent size of a wound or the mildness of the first symptoms cannot, by itself, determine how serious the illness may become. What matters is the child’s developing response. A child who looked reasonably well earlier but is now breathing abnormally, becoming difficult to wake or producing very little urine requires reassessment, regardless of the original diagnosis.
Babies under 12 months are among the groups at increased risk. Children with impaired immunity may also be more vulnerable, including some children receiving chemotherapy, taking immunosuppressive medicines or living with a condition that affects their immune response. Recent surgery, invasive procedures, indwelling medical devices and significant breaks in the skin may provide additional clinical context.
However, the absence of a known risk factor does not rule sepsis out. It can occur in children who were previously healthy.
Looking at the Whole Child
One of the most useful principles in paediatric first aid is to look at the whole child rather than becoming fixed on one symptom.
A temperature reading provides information, but it does not tell the complete story. A rash may be important, but sepsis does not always produce one. Fast breathing can occur with fever or distress, but breathing that looks laboured, exhausting or dramatically different from normal requires urgent attention.
The Resuscitation Council UK First Aid Guidelines 2025 advocate a structured ABCDE approach to identifying and responding to life-threatening conditions. ABCDE stands for airway, breathing, circulation, disability and exposure.
For trained responders, this provides a disciplined way of assessing priorities. Is the airway open? Is the child breathing effectively? Are there signs that circulation is failing? Has their level of responsiveness changed? Is there a rash, injury, abnormal temperature or other clue that becomes apparent when the child is appropriately examined?
The purpose of a structured assessment is not to delay the call for help until every stage has been completed. Life-threatening problems should be addressed as they are found, and additional help should be summoned early.
This principle is especially relevant to suspected sepsis because there is no reliable home test that can confirm or exclude it. The child’s complete presentation, history and changing condition matter more than any one isolated observation.
Warning Signs That Need Urgent Attention
Current NHS guidance on sepsis identifies symptoms in babies and children that require immediate medical attention. The UK Sepsis Trust’s childhood sepsis guidance reinforces many of the same public warning signs.
Call 999 or seek emergency care immediately if a baby or child:
is breathing very fast or having difficulty breathing
is grunting or drawing the area beneath the ribs inwards while breathing
has a fit or seizure
has blue, grey, pale or blotchy skin, lips or tongue
has a rash that does not fade when pressed
is very lethargic, difficult to wake or not responding normally
is confused, has slurred speech or is not making sense
feels abnormally cold or has a very low temperature
has a weak, high-pitched or continuous cry
has symptoms that make you believe they may have sepsis or that something is seriously wrong
Babies and children under five may also stop feeding, vomit repeatedly or produce no urine for 12 hours. A dry nappy can therefore provide important information.
For a baby under three months, a temperature of 38°C or above is an emergency warning sign in the NHS sepsis advice. The NHS also advises emergency action for a baby aged three to six months with a temperature of 39°C or above when sepsis is a concern.
These signs do not prove that a child has sepsis. Several other serious conditions can cause similar symptoms, including meningitis, severe respiratory illness, dehydration and metabolic emergencies. They indicate that the child needs urgent professional assessment.
A child does not need to have every symptom on the list. Nor should a reassuring observation, such as the absence of a rash, outweigh obvious deterioration elsewhere.
Breathing Can Reveal Serious Deterioration
Breathing is often one of the most visible indicators that a child is seriously unwell.
A baby or young child may grunt with each breath, flare their nostrils or draw the soft tissues beneath and between the ribs inwards. An older child may struggle to speak normally because they cannot comfortably complete a sentence.
The speed of breathing matters, but so does the effort involved. A child whose breathing appears exhausting, laboured, unusually noisy or very different from normal requires urgent assessment.
Colour changes can accompany breathing or circulation problems. The skin, lips or tongue may appear blue, grey, unusually pale or blotchy. On black or brown skin, changes may be easier to recognise on the palms of the hands, soles of the feet, lips or tongue.
A single sign can be difficult to interpret in isolation. A frightened child may breathe faster, and cold hands are common. Concern increases when abnormal breathing occurs alongside unusual sleepiness, poor colour, reduced urine output or a rapidly worsening illness.
If a child is struggling to breathe, becoming exhausted or changing colour, do not wait to see whether the problem settles. Call 999.
Behaviour and Responsiveness Matter
Parents and childcare professionals often notice a change in behaviour before they can identify a physical symptom.
A normally active toddler may become unusually still and uninterested in their surroundings. A baby may stop feeding or produce a cry that sounds weak, high-pitched or continuous. An older child may become confused, irritable or unable to answer simple questions normally.
There is a difference between an ill child who is tired but wakes and interacts appropriately, and one who is difficult to rouse or cannot remain awake. The second situation is an emergency.
NICE includes altered behaviour, reduced responsiveness and a parent or carer’s concern within its assessment of children with suspected sepsis. This reflects an important reality: deterioration is sometimes recognised through comparison with the child’s normal behaviour rather than through a piece of equipment.
Statements such as “they have never been like this before” or “I cannot properly wake them” should be communicated clearly to the emergency service.
Temperature Is Only Part of the Picture
Fever is common in children, particularly during viral infections. Most children with a raised temperature do not have sepsis.
Equally, a child with sepsis does not have to have a high temperature. They may have a low temperature, feel abnormally cold or have no striking temperature change at all.
This is why neither the presence nor absence of fever should be used as the sole basis for deciding whether a child is seriously ill. Breathing, circulation, responsiveness, feeding and urine output provide essential additional context.
Temperature thresholds are particularly important in young babies because their risk profile is different. A temperature of 38°C or above in a baby under three months requires urgent medical attention. Parents and carers should not delay seeking advice while repeatedly checking whether the temperature changes.
Fever-reducing medication may improve comfort, but it does not treat sepsis. A temporary fall in temperature does not prove that the underlying illness is harmless, and medication must never delay emergency help.
Urine Output and Feeding Provide Useful Clues
When a child is very unwell, their kidneys may produce less urine because of dehydration or impaired circulation. Reduced urine output is therefore an important observation.
The NHS identifies no urine for 12 hours in babies and children under five as a warning sign. In older children, not urinating throughout the day is concerning.
Parents may notice that nappies remain dry, while nursery staff may realise that a child has not needed their usual change. Older children may say that they have not been to the toilet.
Poor feeding and repeated vomiting also matter, particularly in babies and younger children. These symptoms are common in ordinary illness, but they become more concerning when combined with lethargy, abnormal breathing, poor colour or substantially reduced urine.
The important question is not whether one feed has been missed. It is whether the child’s intake and output form part of a wider pattern of deterioration.
The Rash and the Limitations of the Glass Test
A rash that does not fade when pressed can be associated with meningococcal disease and sepsis. If such a rash is present, call 999 or seek emergency care immediately.
The glass test involves pressing the side of a clear drinking glass firmly against the affected skin. If the marks remain visible through the glass rather than fading under pressure, the rash is described as non-blanching.
The Meningitis Research Foundation and Meningitis Now both emphasise an essential limitation: a seriously ill child may not develop a rash at all. When one does appear, it may be a late sign.
This means the glass test cannot rule out sepsis or meningitis. It is a way of assessing a rash that is already present, not a test that can certify that a child is safe.
A rash may also be more difficult to identify on darker skin. Check areas such as the palms, soles, inside the eyelids and roof of the mouth, but do not allow a prolonged search to delay help when the child is already seriously unwell.
If a child is difficult to wake, breathing abnormally, confused or deteriorating, act on those signs. Do not wait for a rash.
Knowing Whether to Call 999, NHS 111 or a GP
Public advice needs to be clear enough to prompt action without suggesting that every fever requires an ambulance.
Call 999 when the child has an emergency warning sign, appears seriously ill, is deteriorating rapidly or you believe their life may be at risk. Describe what you can see and state clearly that you are concerned about sepsis.
If there is no immediate life-threatening sign but you remain worried about an infection, contact NHS 111, the child’s GP or another appropriate healthcare service. Explain the child’s age, symptoms, temperature if known, breathing, behaviour, fluid intake, urine output and how the illness has changed.
The direction of travel matters. Saying that a child is substantially worse than they were two hours earlier can be more useful than describing each symptom separately.
If the child has already received medical advice but continues to deteriorate, seek help again. A previous assessment reflected the child’s condition at that time. It does not guarantee that the illness has remained unchanged.
The UK Sepsis Trust encourages parents and carers to ask healthcare professionals, “Could it be sepsis?” That question does not make a diagnosis, but it communicates the seriousness of the concern and invites appropriate clinical consideration.
What to Do While Waiting for an Ambulance
Once an ambulance has been requested, remain with the child and follow the call handler’s instructions. Continue to observe their breathing, responsiveness and colour, and report any change.
Allow a responsive child to remain in the position in which they can breathe most comfortably. A child with breathing difficulty may prefer to sit upright. Do not force them to lie flat merely because it appears to be a more conventional first-aid position.
Keep the child appropriately warm, offer calm reassurance and avoid unnecessary movement. Do not give food or drink if their consciousness is reduced or they cannot swallow safely.
If the child becomes unresponsive but continues to breathe normally, place them in the recovery position when it is safe to do so and continue monitoring their breathing.
If they become unresponsive and are not breathing normally, tell the emergency call handler and begin paediatric CPR. The Resuscitation Council UK Paediatric Life Support guidance provides the national clinical foundation for paediatric resuscitation, while an emergency call handler can guide an untrained rescuer through the immediate response. Use an AED as soon as one is available and follow its instructions.
Useful information can be gathered for the ambulance crew without distracting from care. This may include medicines, allergies, medical conditions, recent infections, recent surgery or treatment and the approximate times at which symptoms changed.
How NHS, NICE, RCUK and JRCALC Guidance Fit Together
These organisations have related but different roles, and their guidance should not be presented as though it is interchangeable.
The NHS provides public-facing advice about the symptoms families may encounter and the point at which they should call 999, attend A&E or seek other medical advice. This is the most directly applicable source for parents, carers and members of the public.
NICE provides detailed clinical guidance for recognising, assessing and managing suspected sepsis in people under 16. Its age-related risk criteria are designed for healthcare professionals and services. They are not intended to turn a first aider into a diagnostician.
Resuscitation Council UK provides national guidance on first aid, recognising the seriously ill child, structured assessment and resuscitation. Its 2025 First Aid Guidelines promote the ABCDE approach, early recognition of life-threatening problems and timely contact with emergency services. It does not provide a separate public diagnostic test for childhood sepsis.
The Joint Royal Colleges Ambulance Liaison Committee, known as JRCALC, develops national clinical practice guidance for UK NHS ambulance clinicians. JRCALC guidance covers sepsis and pre-hospital care and is reviewed on a rolling basis. A further sepsis update was listed by JRCALC in August 2026.
The complete current JRCALC clinical guidance is available through its professional publications and applications rather than as a free public first-aid manual. It would therefore be inappropriate to reproduce or paraphrase a paramedic treatment pathway as instructions for parents or first aiders. The relevant public message is that suspected serious illness requires early access to the ambulance service, whose clinicians assess and treat the child according to current professional guidance and local clinical policy.
This separation protects the reader from two opposite risks: oversimplifying a complicated emergency and encouraging an untrained person to attempt clinical decision-making beyond their role.
The Contribution of National Sepsis Charities
National charities have played a significant role in making the warning signs of sepsis more widely understood.
The UK Sepsis Trust provides public symptom information, professional toolkits and support for people affected by sepsis. Its childhood message focuses on very fast breathing, seizures, mottled or pale appearance, non-fading rash, extreme lethargy and feeling abnormally cold. For children under five, it also highlights poor feeding, repeated vomiting and no urine for 12 hours.
Sepsis Research FEAT supports research and public awareness. Its childhood information similarly stresses rapid breathing, temperature changes, poor colour, poor feeding, vomiting, lethargy and reduced urine output.
Meningitis Research Foundation and Meningitis Now provide particularly useful information where meningitis, meningococcal sepsis and non-fading rashes are concerned. Their resources reinforce that symptoms can appear in any order and that a rash may never develop.
These organisations provide valuable education and support, but a charity website must not be used as a substitute for emergency medical help. If a child is seriously ill, call 999 first.
Real World Examples
Consider a toddler in a nursery who was playing normally during the morning but becomes unusually quiet after lunch. Staff initially assume that the child is tired. A little later, a practitioner notices that the child is breathing quickly, making a grunting sound and drawing the area beneath the ribs inwards. The child is difficult to engage, and their nappy has remained dry.
The practitioner does not need to decide whether the cause is sepsis, pneumonia, dehydration or another illness. The breathing difficulty and altered responsiveness are sufficient to call 999. Another member of staff contacts the parent, while the practitioner remains with the child and monitors their condition.
In another situation, a school-aged child has been unwell with flu-like symptoms. During the evening, their parent notices that they have become confused and unusually pale. There is no rash and their temperature is not exceptionally high.
The absence of a rash or extreme fever does not provide reassurance. Confusion and the marked change in the child’s condition require emergency help. The parent calls 999 and says that they are concerned about sepsis.
A third child has a raised temperature but remains alert, is breathing comfortably, is drinking and continues to pass urine. Their parent remains worried because the illness is persisting. There is no immediate life-threatening warning sign, so they contact NHS 111 or their GP for clinical advice and continue to monitor the child closely.
These examples demonstrate why the response should be based on severity rather than an attempted diagnosis. Serious signs justify emergency action even when the precise illness is unknown.
Why Sepsis Awareness Matters in Milton Keynes
Schools, nurseries, sports clubs and community organisations across Milton Keynes care for thousands of children every day. Staff may spend many hours with a child and can be among the first people to notice a meaningful change.
They are not expected to diagnose sepsis. They should, however, understand that serious childhood illness may initially look unspecific and that rapid deterioration must not be ignored.
Emergency arrangements should be practical. Staff need to know who will call 999, who will meet the ambulance, how parents will be contacted and where important medical information is kept. Calling a parent must not delay calling an ambulance when emergency signs are present.
Accurate records can help. The time at which the child first appeared unwell, any temperature obtained, changes in breathing or behaviour, vomiting, urine output and first aid provided may all assist the professionals taking over their care.
DTMK Training Services delivers scheduled paediatric first aid training at our Bletchley venue and private courses for schools, nurseries and childcare teams across Milton Keynes and the surrounding area. Private training can be arranged during the day, in the evening or at weekends, subject to availability.
As a Qualsafe Awards registered centre, DTMK provides regulated qualifications supported by practical scenarios and experienced teaching. Christopher Cook has taught first aid since 1996, and DTMK’s lead trainers bring around 60 years of combined teaching experience.
That experience helps learners understand the boundary between first aid and diagnosis. The aim is not to make staff frightened of every childhood illness. It is to help them recognise when a child’s breathing, colour, responsiveness or behaviour suggests that ordinary observation is no longer enough.
Frequently Asked Questions
Does a child with sepsis always have a high temperature?
No. A child may have a high temperature, a low temperature or no striking temperature change. Breathing, colour, responsiveness, feeding, urine output and the child’s overall condition are also important.
Does sepsis always produce a rash?
No. A rash may appear late or may not appear at all. Never wait for a rash when a child is displaying other signs of serious illness.
Can the glass test rule out sepsis?
No. The glass test only assesses whether an existing rash fades under pressure. A fading rash does not rule out sepsis, meningitis or another serious illness.
Should a first aider try to diagnose sepsis?
No. Sepsis requires clinical assessment and often further investigation. A first aider should recognise serious illness, summon appropriate help, monitor the child and communicate what has been observed.
When should I say that I am worried about sepsis?
If a child has concerning symptoms or seems substantially more unwell than expected, tell the healthcare professional or call handler that you are worried about sepsis. The UK Sepsis Trust recommends asking, “Could it be sepsis?”
Should I wait to see whether paracetamol reduces the temperature?
Do not delay emergency care to see whether fever-reducing medicine works. Such medication may improve comfort but does not treat sepsis. A reduction in temperature does not prove that the illness is harmless.
What is JRCALC?
JRCALC is the Joint Royal Colleges Ambulance Liaison Committee. It develops national clinical practice guidance for UK NHS ambulance clinicians. Its professional sepsis guidance supports pre-hospital assessment and care but is not a public first-aid treatment guide.
What should I tell the 999 call handler?
State the child’s age and location, then describe their breathing, colour, responsiveness, temperature if known, urine output and how quickly their condition has changed. Mention relevant medical conditions or recent treatment and say clearly if you are concerned about sepsis.
Can paediatric first aid training prevent sepsis?
Training cannot prevent every infection or diagnose sepsis. It can help people recognise serious deterioration, call for help promptly and support the child until healthcare professionals arrive.
Summary
Sepsis is a serious reaction to infection in which the body’s response begins to damage its own tissues and organs. It can affect a previously healthy child and may progress quickly.
Recognising sepsis is difficult because its early symptoms can resemble common childhood illnesses. No single symptom, temperature reading or home test can confirm or exclude it.
Very fast or difficult breathing, marked changes in colour, unusual sleepiness, difficulty waking, confusion, seizures, reduced urine output and a non-fading rash are among the signs requiring urgent attention. A child may have sepsis without developing a rash or a high temperature.
Parents, carers and first aiders are not responsible for making the diagnosis. Their role is to recognise serious illness and obtain help.
Call 999 when emergency warning signs are present, when the child appears seriously unwell or when their condition is deteriorating rapidly. Contact NHS 111 or the child’s GP when there is no immediate emergency but concern about an infection remains.
While waiting for help, remain with the child, support them in the position in which they can breathe most comfortably, monitor for changes and follow the call handler’s instructions. If the child becomes unresponsive and stops breathing normally, begin paediatric CPR.
Trusting concern does not mean assuming that every illness is sepsis. It means recognising when the child in front of you is no longer behaving, breathing or responding as they normally would and allowing trained healthcare professionals to make the clinical assessment.
DTMK Training Services provides practical paediatric first aid courses for individuals, schools, nurseries and childcare organisations in Milton Keynes and the surrounding counties. To discuss the most appropriate training for your team, contact DTMK Training Services.
Sources and Further Reading
The clinical and public-health information in this article was checked against the following reputable UK sources:
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