Fever Basics (0–12 months)

Teething may cause slight warmth or irritability, but persistent ≥38°C fever suggests another cause.

Rectal thermometers are most accurate for infants; follow device instructions strictly.

Viral fevers often improve in 2–3 days, but watch overall condition and hydration.

Offer small, frequent sips. If refusal persists or dehydration signs appear, seek care.

What to Expect by Age

Newborns (<3 months) with a measured fever ≥38°C (100.4°F) should be evaluated promptly.

From 3–12 months, mild fever can accompany common viral illnesses; behavior and hydration matter most.

Thermometer method influences accuracy (rectal is most reliable in infants).

Fever alone is not an illness; it is a sign. Focus on breathing, hydration, responsiveness.

Any infant <3 months with ≥38°C.

Any age with breathing difficulty, bluish lips/face, persistent vomiting, seizure, or unresponsiveness.

Dress lightly; keep room cool and ventilated.

Offer fluids frequently; monitor diapers and alertness.

Avoid cold baths or alcohol rubs.

This article is general guidance and not a diagnosis. Follow local medical advice.

Is teething causing fever?

Teething may cause slight warmth or irritability, but persistent ≥38°C fever suggests another cause.

Which thermometer is best?

Rectal thermometers are most accurate for infants; follow device instructions strictly.

How long can fever last?

Viral fevers often improve in 2–3 days, but watch overall condition and hydration.

What if baby refuses fluids?

Offer small, frequent sips. If refusal persists or dehydration signs appear, seek care.

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