Quick read
Key points
- 1
A fever is a normal response as the body fights an infection, and in most children is caused by a common viral illness that will pass on its own within a few days. A temperature of 38°C (100.4°F) or higher is generally considered a fever in children.
- 2
Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
- 3
Your baby is 3-6 months old with a temperature of 39°C or higher
01 · Know
What is High Temperature - Fever in Children?
A fever is a normal response as the body fights an infection, and in most children is caused by a common viral illness that will pass on its own within a few days. A temperature of 38°C (100.4°F) or higher is generally considered a fever in children.
While fever itself is rarely dangerous and is actually part of a healthy immune response, certain patterns — especially in very young babies, or fever accompanied by other symptoms — need prompt medical assessment.
02 · Understand
Clinical context
The exact temperature matters less than how your child looks and behaves
A child with a high temperature who is alert, drinking fluids, and interested in their surroundings is generally reassuring, whereas a child who seems very unwell, even with a lower temperature, is worth taking seriously.
03 · Act
When to Contact a Doctor (Non-Emergency)
- 1Your baby is 3-6 months old with a temperature of 39°C or higher
- 2Fever lasts more than 5 days
- 3Your child isn't drinking enough fluids
- 4You're simply unsure or worried, regardless of the exact temperature
04 · Prevent & manage
Practical steps
Fever Itself Doesn't Need to Be 'Treated Away'
The goal of fever medication is to help your child feel more comfortable, not necessarily to bring the temperature down to normal — a slightly raised temperature in a child who is otherwise comfortable and playing doesn't need medication.
- 1Keep your child comfortable, not bundled up.Light clothing and a comfortably cool room are better than lots of layers or blankets.
- 2Offer plenty of fluids.This is important to prevent dehydration, especially if your child is eating less than usual.
- 3Give paracetamol or ibuprofen if your child is uncomfortable.These help with comfort, not to force temperature down — follow package instructions for age and weight.
- 4Watch your child's behaviour, not just the number.How your child is acting is often more informative than the exact temperature reading.
- 5Check on your child regularly, including through the night.This helps you catch any changes or warning signs early.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: High temperature - fever in children ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Fever is a normal, healthy immune response, and most fevers in children are caused by common viral illnesses that pass on their own.
A baby under 3 months old with any fever should always be seen urgently, since young babies can become unwell very quickly.