Q: My 10-month-old baby has a fever for 5 days, reaching 39°C despite alternating medications. Should we go to the ER?
- Myeongchan Kim
- Jun 13
- 3 min read
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
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:
My 10-month-old baby currently has a fever of 39°C. Should I take them to the emergency room? The fever started a few days ago, fluctuating around 38.5°C. At first, it would go up and down even without alternating fever reducers. We had two flu tests done, but both came back negative. We visited the doctor again a couple of days later and changed the medication, but my baby has a severe cough and runny nose, and the fever consistently stayed over 38°C. I was planning to visit the clinic again tomorrow, but the temperature suddenly spiked to 39°C today. Even with cross-dosing and tepid water massages, the fever is not dropping. Since this is already the 5th day of the fever, should we head to the ER right now?
Answer:
It is completely understandable that you are very worried, especially with your baby's fever reaching 39°C on the 5th day.
Symptoms to Check Right Now
Please check if your baby has any of the following symptoms. If ANY of these are present, you need to visit the emergency room immediately for evaluation:
Difficulty breathing: You can see the skin pulling in under their ribs (chest retractions) or their nostrils flaring when they breathe.
Cyanosis: The lips or fingernails are turning blue.
Dehydration: There has been no wet diaper for over 8 hours, the baby is crying without tears, or the inside of the mouth is severely dry.
Extreme lethargy: The baby is constantly limp, cannot make eye contact, or is very difficult to wake up.
Neurological signs: The baby's neck seems stiff, or they are extremely irritable with repeated vomiting.
If your baby does not have any of the above symptoms, is drinking small amounts of water or breast milk/formula, and is generally responsive when awake, it is usually safe to wait and visit your pediatrician tomorrow morning.
What to Do at Home Right Now
Stop the tepid water massages: These can actually induce shivering, which can raise the core body temperature and cause discomfort.
Keep them comfortable: Dress your baby in a single light layer of clothing and maintain a comfortable room temperature (around 22–24°C).
Hydrate frequently: Offer a few sips of water, formula, or breast milk every 5–10 minutes. Hydration is key.
Manage fever for comfort: Give fever reducers based on how uncomfortable the baby is, rather than focusing solely on the number on the thermometer.
Cross-dosing: If one medication isn't bringing relief, you can alternate with a different type of fever reducer (e.g., ibuprofen and acetaminophen) leaving a 2-3 hour gap in between. However, you must strictly follow the dosing intervals and maximum daily limits for each specific medication.
Next Steps
Even if the flu tests were negative, other common respiratory viruses (such as Adenovirus or RSV) can frequently cause fevers that last 5 to 7 days.
Please visit your pediatrician again tomorrow for a re-evaluation. Be sure to clearly inform the doctor that the baby has had a "high fever for 5 days, worsening cough and runny nose, and a poor response to fever reducers." Depending on the assessment, the doctor may want to listen to the baby's chest closely, check oxygen saturation, or run a urine test.
Remember, if any of the urgent "red flag" symptoms listed above appear at any point, do not wait—go to the nearest emergency room immediately.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
