Use this as orientation, not diagnosis. If you are worried about how a child looks, breathes, responds or drinks, seek medical advice even if the temperature itself does not seem very high.

What counts as a fever?

The NHS defines a high temperature in babies and children as 38°C or more. A digital thermometer is generally the simplest way to check. The number is useful, but the child’s age and condition are equally important.

Look at the child, not only the thermometer

The American Academy of Pediatrics advises parents to watch for signs of serious illness and pay attention to how the child behaves. A child who is alert, interacting and drinking is different from a child who is unusually sleepy, difficult to wake, struggling to breathe or unable to keep fluids down.

Useful things to observe: Is the child drinking? Passing urine? Responding normally? Breathing comfortably? Developing a new rash? Vomiting repeatedly? Becoming progressively more unwell?

When younger age changes the threshold

Young infants need a lower threshold for medical assessment. The AAP advises contacting a doctor right away for a baby younger than 3 months with a temperature of 38°C (100.4°F) or higher. NHS guidance likewise treats fever in very young babies as requiring prompt advice.

Red flags that need urgent medical attention

  • Difficulty breathing, very fast breathing, grunting or the chest pulling in with breaths.
  • Unusual drowsiness, difficulty waking, confusion or markedly reduced responsiveness.
  • A seizure, especially a first seizure.
  • A stiff neck, severe headache or a concerning rash, including a rash that does not fade with pressure.
  • Signs of dehydration such as very little urine, sunken eyes, no tears, inability to drink or persistent vomiting.
  • A child who looks seriously ill or is getting worse regardless of the measured temperature.
Do not delay because a webpage says “watch and wait.” If your instinct is that the child is seriously unwell, use professional medical services.

What parents can usually focus on at home

For a child who is otherwise well enough to be cared for at home, the common priorities are fluids, comfort and observation. Continue breastfeeding normally for a breastfed child. Medicines for discomfort should be used only according to the child’s age, weight, product instructions and professional advice. Do not use aspirin in children.

A fever itself is a body response to illness; the goal is not to force the temperature to a perfect number. The more important goal is to keep the child comfortable, hydrated and under observation while watching for deterioration.

References

  1. NHS. High temperature (fever) in children.
  2. American Academy of Pediatrics, HealthyChildren.org. Fever: When to Call the Pediatrician.

This resource summarizes recognized guidance in plain language and does not reproduce a source verbatim.