General care

When a child's fever needs a doctor

A fever on its own is not usually an emergency — it's the immune system doing its job. What actually matters is the child's age, how high the temperature is, how long it lasts, and what else is going on alongside it.

Fever is defined as a body temperature above the normal range, most commonly measured at 38°C (100.4°F) or higher. It's a response, not a disease in itself — the body raises its temperature to make itself a less hospitable place for many viruses and bacteria to multiply. Most fevers in children are caused by common viral infections and resolve on their own within a few days.

Age changes the calculation

A fever means something different depending on how old a child is. In a baby under three months, any fever at or above 38°C is treated as needing prompt medical attention, because a very young infant's immune system hasn't yet developed the ability to fight off certain infections the way an older child's can, and the same infection can progress faster. Between three and six months, a fever above 39°C warrants a same-day call. Past six months, a healthy, alert child with a moderate fever can often be watched at home for a day or two — but the warning signs below apply at any age.

Warning signs that mean call now, not later

Regardless of the exact number on the thermometer, certain signs mean a fever should be checked promptly rather than watched:

A fever lasting more than three days without improving. A child who is unusually difficult to wake, limp, or not responding normally. Breathing that looks fast, laboured, or noisy. A stiff neck, a persistent headache, or sensitivity to light. A rash that doesn't fade when pressed. Signs of dehydration — a dry mouth, no tears when crying, or noticeably fewer wet nappies or trips to the toilet than usual. A seizure, even a brief one. And, simply, a parent's own sense that something is off — that instinct is worth acting on rather than talking yourself out of.

What can usually wait until a routine visit

A moderate fever in an otherwise alert, drinking, playful child — even one who seems tired or clingy — is often manageable at home with fluids, rest, and appropriate fever-reducing medicine dosed for the child's weight. The fever itself is rarely dangerous at these levels; it's the accompanying symptoms and the trend over time that matter more than the number on any given reading.

Why a familiar doctor makes this easier

Fever calls are exactly the situations where having an established pediatrician — one who already knows a child's history — saves real time and worry. A doctor who has seen a child through previous illnesses has context a first-time visit doesn't: what's normal for that child, what's changed, and how quickly to escalate. That familiarity is part of why many parents stay with the same pediatrician for years rather than starting over with someone new every time a child is unwell.

If in doubt, it's always reasonable to call and describe what you're seeing rather than trying to make the call alone at home.