Call the doctor if your baby is under 3 months old and has any fever.Call the doctor if your baby is between 3 and 6 months old and has afever of 3.8.3ºC or higher.Call the doctor if your baby is over 6 months old and has a fever of39.4ºC or higher.Call the doctor if your baby has fever with breathing difficulties.Call the doctor if your baby has fever with swallowing difficulties.Call the doctor if your baby has fever associated with severe pain orheadache or stiff neck or coloured patches on the skin.Call the doctor if your baby has fever and sore throat for more than24 hours.Call the doctor if your baby has fever for no obvious reason.Call the doctor if your baby has fever for more than 3 days in a row.Call the doctor if your baby has fever and is lethargic or refuses toeat.A LAST WORD OF ADVICE: Fever is one of the serious symptoms inbabies never to ignore [/en/never-ignore-serious-baby-symptoms]!