Q: How long does a fever from a cold and swollen throat last in a 126-day-old baby?
Updated: Sep 7
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 126-day-old baby has a severe head cold. A mild fever started early yesterday morning, and the doctor mentioned a swollen throat (we were prescribed antibiotics and other medication). Yesterday afternoon, the temperature reached 38.2°C, but it went straight down after one dose of a fever reducer. However, this morning the temperature is creeping back up to 37.7–37.8°C.
How many days can a fever caused by a swollen throat last? I've heard it can last for about 3 days, but our pediatrician told us to consider hospitalization if the temperature hits 38°C two times. I am very worried.
Answer:
It is completely understandable to be worried when your young infant has a cold and a fever.
A fever caused by viral pharyngitis (a swollen throat) typically fluctuates and can last for about 2 to 3 days. The fact that the fever responded very well to the fever reducer yesterday (dropping quickly from 38.2°C) and is currently in the mild range (37.7–37.8°C) is a positive sign. It indicates that the medications are likely working as intended.
Understanding Your Doctor's Advice:
When your doctor mentioned considering hospitalization if the temperature hits 38°C twice, this was meant as a clinical safety net. In infants this age, if high fevers repeatedly occur despite taking antibiotics, it indicates that a re-evaluation, blood tests, or hospital observation might be necessary. However, since the fever has responded well to medication and is currently mild, your immediate priority should be to continue administering the prescribed medication and closely observing your baby's condition.
Home Care Guidelines for Today:
Nasal Care: Use saline drops followed by a nasal aspirator to frequently clear your baby's nose. Doing this right before feeding and sleeping is essential.
Environment: Keep the room temperature comfortable (around 22–24°C) and maintain indoor humidity between 40–60%. Dress the baby in light, breathable clothing.
Hydration: Offer frequent, smaller amounts of breast milk or formula to ensure your baby stays well-hydrated.
Fever Management: Only administer a fever reducer if the temperature reaches 38.5°C or higher, or if the baby is visibly very uncomfortable.
When to Seek Immediate Medical Attention:
Please follow up with your doctor or visit an emergency room right away if you observe any of the following warning signs:
A high fever of 38.5°C or higher repeats twice or more in a day.
Signs of breathing difficulty (e.g., flaring nostrils, or the skin pulling in under the ribs/chest when breathing).
Your baby becomes extremely fussy or unusually lethargic and unresponsive.
Feeding amounts drop to less than half of normal, or there are no wet diapers for 8 hours.
The baby's lips or extremities turn blue.
For now, focus on keeping your baby's nose clear and ensuring they are well-hydrated. Continue monitoring their temperature, and do not hesitate to contact your doctor for a re-evaluation if you notice any of the warning signs listed above.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
