Signs of serious illness in children factsheet

Introduction

As a parent or carer, you know best what your child is like when they are happy and healthy.

You will also be able to notice the small changes in your child that can tell you they are becoming unwell.

Mild illnesses like a cough or cold may be managed at home, and depending on how your child feels you might wait to see if they get better over a few days before seeing your local doctor.

Some signs and symptoms of illness can indicate that your child is very unwell and needs medical attention.

If your child shows signs of serious illness or you are worried, see your local doctor as soon as possible.

This factsheet explains how to care for your sick child and when to seek help. It is a general guide and is not designed to replace a medical consultation. If you are worried about your child's health, it is best to speak to a doctor or qualified healthcare professional. 

 Things to consider

Alertness and Irritability

A child who is unwell may become less active, drowsy and want to sleep more than usual. 

More serious signs can include:

  • floppiness
  • a weak cry
  • irritability
  • not responding to people or things around them.

Breathing difficulty

When a child is having difficulty breathing, they may:

  • have a blue, green, white, or grey colour around the lips, tongue, gums, ears, and fingernails
  • flare their nostrils when breathing in through the nose
  • make noses like grunts, coughs, wheezes, and snores
  • breathe very fast
  • have retractions - when skin pulls in around the chest, neck, and ribs in an upside-down V-shape as they breathe
  • bob their head back and forth
  • sit leaning forward on their arms
  • stop or pause breathing.  

Breathing difficulty is a medical emergency. Call triple zero (000) for an ambulance or go to your nearest emergency department.

Skin colour and appearance

Serious signs of illness on the skin can include:

  • cyanosis – lack of oxygen that causes a blue, green, white, or grey tint around the lips, tongue, gums, ears, and fingernails
  • skin that is paler than normal 
  • skin that is a purple-mottled colour 
  • bright red or purple spots or bruises.

A purple rash that does not blanch or fade when pressed can be serious and may be a sign of meningococcal infection. 

You can check for this at home by pressing a clear drinking glass on the skin and seeing if the rash fades. If the rash does not fade, call your local doctor immediately.

Fluids in and out

Children are at risk of dehydration if they lose more fluid through vomiting and diarrhoea than they take in through eating and drinking.

Serious signs of dehydration can include:

  • dark urine 
  • fewer wet nappies or trips to the toilet than usual 
  • sunken eyes 
  • skin that looks more pale than normal 
  • dry lips or tongue 
  • in young babies - a sunken fontanelle, the soft spot in the head.

Other serious signs include:

  • blood in urine or poo
  • green or yellow-coloured vomit.

These signs are a medical emergency. Call triple zero (000) for an ambulance or go to your nearest emergency department. 

Fever

Fever is a body temperature higher than 38°C.

Fever is usually a general sign of illness, but can be more serious depending on:

  • how old your child is
  • how long the fever goes for
  • other symptoms that your child has, like shivering.

If your child has a fever and is:

  • under 3 months old – go to your nearest emergency department
  • up to 12 months old and you are concerned - see your local doctor.

See your local doctor if your child is over 12 months old and the fever lasts for more than 4 days.

Seizures and fits

Seizures are short, sudden, uncontrolled changes in your child’s movement and behaviour.

They can be caused by:

  • high fever, also known as febrile seizures
  • trauma to the head
  • illness
  • conditions like epilepsy.

During a seizure, you will need to:

  • move away any objects your child could hit or fall onto
  • place something soft under their head
  • try rolling them onto their side.

Seek medical attention if your child:

  • has a seizure for the first time
  • has a seizure lasting longer than 5 minutes
  • has a seizure in water and has trouble breathing
  • has an injury during or after the seizure
  • inhales liquid or food during the seizure
  • doesn’t breathe normally after the seizure 
  • stays blue around the lips
  • is not recovering normally.

Sepsis: signs to look out for

A very small number of children with fever may develop a serious infection called sepsis that requires urgent treatment in hospital.

Sepsis is rare, but any child can develop sepsis and we all need to know what to look out for.

Knowing if your child has sepsis is difficult because many of the early symptoms of sepsis are seen in common mild infections. The difference with sepsis is that your child will become more severely ill.

If you think your child is not getting better, or they are getting sicker, trust your gut feeling and seek medical advice.

Use the Green, Yellow, Red guide below to record your child’s symptoms, and remember to ask your nurse or doctor, “Could this be sepsis?”

Download our checklist: Recognising signs of serious illness

 Management

Caring for your sick child at home

  • If your child is hot to touch, take their temperature with a thermometer, preferably under the arm. See fever factsheet
  • Children with fever should not be under or over-dressed. If your child is hot to touch, remove a layer of their clothing
  • Sponging is no longer recommended for the treatment of fever
  • Offer your child regular drinks. Fever increases sweating and fluid loss from the body. If a baby is breastfed, the most appropriate fluid is breast milk/formula
  • Read about fluids to give your child
  • Keep a diary of symptoms including what your child is eating/drinking and when they are passing urine
  • If your child is due for immunisations, please consult your doctor for advice, there may be no need to delay their appointment. 
  • If you need to keep your child away from childcare or school whilst they are unwell, please notify the childcare or school. Your doctor will be able to advise you if you are unsure.
  • Check your child during the night to monitor symptoms.

Medications that help

Medications that can help If your child is distressed, or unwell (do not use if your child has any allergies or contraindications to these medications): 

  • Paracetamol (e.g. Panadol, Dymadon) if more than 1 month old
  • Ibuprofen (e.g. Nurofen, Advil) if more than 3 months old 
  • Don’t give both Paracetamol and Ibuprofen at the same time — use one first and if your child has not improved 1-2 hours later, you may want to try giving the other medication. 
  • Please read the instructions on the medication bottle first for dose and frequency. 
  • Be aware of the maximum dose which can be given over a 24-hour period. 
  • Never give Aspirin to a child unless prescribed by their doctor. 
  • You can ask your local community pharmacist for more advice about medication. 
  • Most children handle fever well. You can use medications to help your child feel better if they are uncomfortable and irritable.

Disclaimer

This factsheet is provided for general information only. It does not constitute health advice and should not be used to diagnose or treat any health condition.

Please consult with your doctor or other health professional to make sure this information is right for you and/or your child.

The Sydney Children’s Hospitals Network does not accept responsibility for inaccuracies or omissions, the interpretation of the information, or for success or appropriateness of any treatment described in the factsheet.

© Sydney Children’s Hospitals Network 2024


This factsheet was produced with support from John Hunter Children's Hospital.