It is completely natural to feel anxious when your baby develops a fever after their vaccinations. Seeing your little one fussy, less interested in feeding, or even experiencing a bit of spit-up can be stressful, but these symptoms are often a normal immune response to the immunization.

Monitoring the Situation

If your baby develops a fever (typically considered over 100.4°F/38°C), keep a close eye on their behavior. If the fever is mild, you can help your baby feel more comfortable by removing excess layers of clothing or using a lukewarm damp cloth on their forehead. It is common for babies to be less interested in nursing during this time, but try to offer the breast frequently to keep them hydrated.

Managing Your Comfort

If your baby is feeding less frequently, you may experience engorgement. To stay comfortable and maintain your milk supply, consider pumping to express milk. If the baby isn't ready to eat, you can store this milk for later use.

When to Call the Pediatrician

While most post-vaccine symptoms subside within 48 to 72 hours, always trust your instincts. If the fever reaches a concerning level, if your baby seems unusually lethargic, or if symptoms persist beyond a few days, consult your pediatrician immediately. There is no such thing as being 'too careful' when it comes to your baby’s health—when in doubt, seek professional medical advice, even if it’s outside of regular office hours.