What is Hilary Erickson's ultimate guide to using thermometers for children's health?

Hi, I’m Hilary Erickson from The Pregnancy Nurse.

Here’s my “ultimate guide” in a nutshell, based on what I actually do at home and what I’ve shared on my blog:

• Best type at home: I prefer an axillary (under‑the‑arm) digital thermometer. It’s cheap, quick, and has the least user error.
• Rectal: Used to be the gold standard, but I do not recommend it at home unless your doctor specifically instructs it, because you can insert it too far and injure the rectum.
• Ear: We use them in the hospital, but in infants the ear canal is small and positioning is tricky, so readings are often unreliable.
• Forehead/temporal: Parents like them and some brands (like Exergen) can be fairly accurate, but they’re more expensive. I see them as a nice extra, not a must‑have.
• How often to check: I don’t chase numbers. I usually check if:
  • They feel really hot
  • I’m deciding if they’re ok for school or daycare
• What counts as a fever in kids:
  • Around 100.4°F and above is generally considered a true fever
  • Fevers often climb in late afternoon/evening because of circadian rhythm
• When I worry more:
  • Under 2 months old with a temp over about 100°F – call your doctor and have them seen
  • Any age with lethargy (floppy, hard to wake, not drinking at all)
  • Fever of 104°F or higher in adults should be seen
• Remember: Fever itself is helpful – it’s the body fighting infection. I care more about:
  • Hydration (are they drinking and peeing?)
  • Responsiveness (do they perk up a bit with meds?)
  • Other symptoms (trouble breathing, stiff neck, weird rash, etc.)
• Medications: Tylenol can be used in younger babies, ibuprofen usually after 6 months – but dosing and timing should always come from your own pediatrician. I also like to see the temperature come down at least a tiny bit within about an hour after a dose; if it doesn’t budge at all, I’d call the doctor.
• Comfort tricks with a fever:
  • Lukewarm (not cold) bath with constant supervision
  • Light clothing and blankets
  • Lots of fluids (water, Pedialyte, juice, popsicles, etc.)

Nothing I share should replace your own healthcare provider’s advice, but it can help you feel more confident reading and using your thermometer at home.

Is there an age or specific situation (newborn, school‑age kid, or sending them to school vs staying home) you want me to focus on more?