Q: My 70-day-old baby has a mild fever of 37.6°C after vaccinations and is refusing to nurse. Should I give a fever reducer?
- Myeongchan Kim
- 10 hours ago
- 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 70-day-old baby got vaccinated today. Right now, the baby's temperature is between 37.5°C and 37.6°C. My baby is still playing a bit, but is crying and completely refusing to nurse. Normally, my baby is a very good eater. The thermometer screen is showing red.
Should I give a fever reducer now? Usually, my baby falls asleep while nursing or being carried in a baby carrier. I am afraid that using the baby carrier might make the fever go higher, but since my baby is crying and won't nurse, I am wondering if giving a fever reducer is the better option.
Answer:
It is completely understandable to be concerned by a mild fever in a 70-day-old baby after vaccinations.
Current Situation
A temperature of 37.5°C to 37.6°C is considered a mild fever. Since your baby is still playing, this is not an immediately dangerous situation. A mild fever and fussiness within 24 to 48 hours after vaccination are very common reactions.
Using a Fever Reducer
The most important factor is not the number on the thermometer, but whether your baby is uncomfortable. Since your baby is unusually fussy and refusing to feed, you can safely give Acetaminophen (e.g., Tylenol) to help relieve the discomfort.
Dosage: 10 to 15 mg per kg of your baby's body weight per dose.
Frequency: Every 4 to 6 hours, up to a maximum of 5 times a day.
Measurement: Check the concentration (mg/mL) on the medicine bottle label and use the enclosed oral syringe to measure the exact amount.
Home Care Tips
Clothing & Environment: Dress your baby in a single, light layer of clothing. Keep the room temperature comfortable, ideally between 22°C and 24°C (71°F–75°F).
Sleep: You are correct that a baby carrier can trap body heat and raise your baby's temperature. Instead of using the carrier, try holding your baby lightly in your arms or lying down next to your baby and gently patting them to sleep.
Feeding: If your baby refuses the breast, offer small amounts frequently (every 5 to 10 minutes). Do not force the feed; simply moistening your baby's lips can help.
Hydration: Keep a close eye on wet diapers. Going 6 hours without a wet diaper is a sign of potential dehydration.
When to Seek Immediate Medical Attention
Please take your baby to see a doctor today if you observe any of the following danger signs:
The temperature reaches 38.0°C (100.4°F) or higher, or the fever lasts for more than 24 hours.
Your baby becomes extremely lethargic, avoids eye contact, or is difficult to wake up.
There are no wet diapers for 6 hours or more.
Your baby shows signs of breathing difficulty (such as wheezing, grunting, or the skin pulling in around the ribs).
The crying becomes severe and inconsolable.
Once the fever reducer helps your baby feel more comfortable, their appetite will likely return. Continue to monitor your baby's temperature, feeding habits, and wet diapers closely tonight. If the symptoms persist or your baby's condition does not improve by tomorrow morning, please consult your pediatrician for an in-person evaluation.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
