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My baby is 6 weeks old and has a slight fever of 38.1°C. Should I be worried?
I completely understand — a fever at six weeks old stops your heart for a moment, and you're right to take it seriously.
In babies under 3 months, any rectal temperature of ≥ 38°C (100.4°F) is considered medically significant. At 38.1°C your daughter is exactly at that threshold. This doesn't mean something is terribly wrong — but at this age, the immune system can't communicate the way an older baby's can, and doctors need to assess quickly.
Both the AAP and the Canadian Paediatric Society recommend contacting your doctor or going to emergency now — even if she seems otherwise well. Timing matters here.
While you're getting ready: keep her lightly dressed, offer feeds if she'll take them. You're doing exactly the right thing by not waiting.
So relieved to hear she's okay — that must have been an exhausting few hours. You did exactly the right thing going in.
For viral fevers in young infants, research shows they typically resolve within 3 – 5 days. They come and go in waves rather than staying constant — completely expected. What matters more than the number is how she's doing: Is she feeding? Having wet nappies? Responding to you?
Keep offering feeds frequently — hydration is the most important thing. You don't need to medicate the fever just to lower the number.
Return to emergency if her temperature climbs above 39°C, she becomes very difficult to rouse, refuses two feeds in a row, or your gut tells you something is wrong. Your instincts count for a great deal.
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Research-backed answers · Not medical advice · Always see your doctor for concerns