🌡 All Ages
Fever in Babies: What Temperature Is Normal and When Is It Serious?
What temperature counts as a fever in babies, how do you measure it, and when should you see a doctor? A calm, clear fever guide to turn to in a moment of panic.
First, a clear definition: what temperature is a fever?
The general rule: a reading of 38.0°C or higher is a fever. A range of 37.5-38.0°C is considered 'subfebrile' (a mild elevation) and can occur for harmless reasons such as clothing, room temperature, or teething.
Where you take the reading matters: in babies the most reliable results come from the armpit or (if your doctor recommends it) a rectal measurement. Contactless forehead readings are convenient but less precise; confirm a questionable result with an armpit reading.
The most critical rule: your baby's age
How serious a fever is depends on age far more than on the number itself:
- 0-3 months: any fever of 38°C or higher is an EMERGENCY — go to a healthcare facility without waiting
- 3-6 months: for a fever above 38.5°C or one that won't come down, consult a doctor the same day
- 6 months+: your baby's overall condition matters more than the number — a baby who is playing and feeding is usually less worrying
What you can do at home
The goal isn't to 'reset' the temperature but to keep your baby comfortable:
- Plenty of fluids: increase the frequency of breastfeeding/formula feeds
- Light, minimal clothing — the habit of bundling up backfires with a fever, trapping heat
- Keep the room cool to mildly warm (around 22-24°C)
- A lukewarm shower or sponge-down only if it doesn't distress your baby; do NOT use cold water or vinegar water
- ONLY your doctor decides on fever-reducing medication and its dose — it varies by age and weight
When to see a doctor or go to the ER right away
Don't wait if any of the following are present:
- Your baby is under 3 months old with a fever of 38°C or higher
- A rash, stiff neck, vomiting, or difficulty breathing along with the fever
- A febrile seizure (convulsion)
- Extreme drowsiness, being unable to wake, constant moaning, or completely refusing to feed
- Signs of dehydration such as fewer tears or fewer wet diapers
- A fever lasting longer than 72 hours
After the fever breaks
After the fever (especially between 6 months and 2 years) a pink rash may appear on the trunk; this pattern is often linked to roseola (the 'sixth disease') and usually clears on its own — even so, it's best to show the rash to your doctor. Once the fever has come down there's no need to bundle your baby up; normal clothing is enough.
🐦 Easier with Maiyko
In Maiyko's health module you can log fever readings with their timestamps and show the whole course on a single screen when you visit the doctor — the question "what was it last night?" won't get lost in the panic.
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⚕️ Health note: This guide is for general information only; it is not a substitute for medical advice. Every baby is different — for decisions about your baby's sleep, feeding, and health, consult your pediatrician.