Q: My 20-month-old has had a fever of 39.8°C for 5 days with mild gastroenteritis. Should we see a doctor again?

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Question:

Hello, my 20-month-old baby was taking non-antibiotic cold medicine when they developed a fever last Thursday afternoon. The fever would drop after taking fever reducers but then spike again. We went to the pediatrician on Saturday morning, and they diagnosed it as gastroenteritis (stomach flu) and prescribed medication. My baby had vomiting and diarrhea, but it was mild—only about once a day. However, the fever has persisted until early this morning, reaching as high as 39.8°C. Can a fever from gastroenteritis last this long? Should we see the doctor again? I have been giving fever reducers three times a day all weekend.

Answer:

You have worked so hard taking care of your child with a high fever all weekend.

【Current Situation Summary】

• Fever started on Thursday afternoon → Today is the 5th day

• Diagnosed with gastroenteritis on Saturday + taking medication

• Mild vomiting and diarrhea (about once a day each)

• Maximum temperature of 39.8°C, dropping with fever reducers and rising again repeatedly

【Please Seek Medical Attention Today】

If any of the following apply → Visit urgent care or revisit your pediatrician today

• Fever lasting for 5 days or more (Applies to your current situation)

• Decreased urination (diaper dry for more than 6 hours)

• Lethargy, weak eye contact, or severe fussiness

• Dry lips or tongue

• Sudden increase in vomiting/diarrhea, or bloody stool

A fever from gastroenteritis usually improves within 2 to 3 days. If it persists until the 5th day, it is necessary to check for other possible infections (such as a urinary tract infection or middle ear infection).

【While on the Way to the Clinic】

• Give small sips of water, breast milk, or formula every 5-10 minutes

• Dress the baby in light clothing and keep the room at a comfortable temperature

• Bring a record of the medications and fever reducers your baby is currently taking

If your current pediatrician is open, please contact them first. If they are closed, use a local urgent care center.

Please get re-evaluated today, and let us know the results so we can arrange the next steps together.

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