Q: My 1-year-old baby frequently gets high fevers over 40°C (104°F). Do we need additional testing?

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

Question:

Hello Doctor. My 1-year-old baby tends to get fevers frequently, and they often spike to 40°C (104°F). They always get a fever after vaccinations, and even with a mild sore throat, it easily goes over 39°C (102.2°F). Yesterday, despite having no major symptoms, the fever spiked over 40°C again, just a month after the last time. Do we need to do any additional tests? Is it normal to have high fevers this often? Fortunately, the baby's overall condition and energy levels are always very good.

Answer:

You must be very worried since high fevers of 40°C (104°F) are repeating every month.

[Current Condition Check]

• If the baby's condition is good, they are playing well, and hydration is adequate → You can observe them at home.

• If any of the following apply → Visit urgent care or a pediatrician today:

- Breathing is rapid, or the area under the ribs retracts when breathing.

- No urination for more than 8 hours.

- The baby is lethargic and unable to make eye contact.

- Stiff neck or accompanied by severe headache/vomiting.

[What to Do at Home Now]

• Fever reducers: Tylenol (Acetaminophen) 10–15 mg/kg or Ibuprofen 5–10 mg/kg, every 4–6 hours.

→ Check the concentration (mg/mL) on the bottle label and measure accurately with the enclosed syringe.

• Dress the baby in light clothing, maintain room temperature, and provide small amounts of fluids frequently.

• Avoid wiping with wet towels or giving lukewarm baths, as these can actually induce shivering.

[When Evaluation for Recurrent High Fevers is Needed]

If 40°C high fevers regularly repeat every month after the first birthday and show a specific pattern (e.g., lasting 3–5 days then resolving naturally, accompanied by mouth ulcers or a sore throat) → The possibility of periodic fever syndromes (such as PFAPA) can be considered.

Questions to Discuss with Your Pediatrician

• "High fevers are repeating every month. Would it be helpful to record the patterns?"

• "Do we need to consider conditions like periodic fever syndrome?"

• "Are additional tests (blood, urine, inflammatory markers) needed right now, or is it better to re-evaluate after keeping a fever diary?"

Things Good to Keep a Record Of

• Date the fever started, highest temperature, and duration.

• Accompanying symptoms (sore throat, mouth ulcers, swollen lymph nodes, abdominal pain, etc.).

• Response to fever reducers (does the fever drop well, and for how many hours does it stay down?).

• Interval between fever episodes (e.g., every 3 weeks, every month).

[When to Contact Us Again]

• If the fever lasts for more than 3 days or repeats more frequently.

• If new symptoms (rash, joint pain, weight loss, night sweats) appear.

• If the baby's condition declines even with fever reducers, or if they cannot stay hydrated.

For today, please note the observation points above, and try to organize the pattern during the next high fever episode—that record will be very helpful for your future medical consultations.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

https://fevercoach.us