Measuring your child's fever
When you report that your child has an increased temperature, your healthcare professional should take this seriously.
Your healthcare professional should measure and record your child's temperature (usually by using a thermometer under the arm or in the ear).
Fever in babies under 3 months is rare and can be a sign of serious illness or infection. If your baby is younger than 3 months and has a fever (38°C or above), or is between 3 and 6 months of age with a temperature of 39°C or above, you should seek advice from a healthcare professional. Sometimes vaccines can cause a fever in children under 3 months, but it is always best to seek advice if you are unsure.
However, if your child is older than 6 months the height of their temperature alone is not the most useful indicator of whether they are seriously ill – healthcare professionals use other signs and symptoms to assess how ill a child is.