Fever after vaccination in babies: when is it normal?
⚡ Short answer: Vaccine fever usually passes in 24-48 hours (live virus vaccines may have delayed fever 5-12 days later); focus on overall health, not the number — under 3 months with ≥38°C, see a doctor directly.
Anonymous
5 aylık bebek annesi · Health
Baby has a fever after every vaccination and gets fussy. How long does vaccine fever last, and when should I worry?
Maiyko AI ADVISOR
The real reply from the in-app AI advisor
Fever and fussiness after vaccination are common and show the immune system is working, but I know it's stressful. Usually vaccine fever passes in 24-48 hours. Some vaccines (especially live ones like MMR) can cause delayed fever 5-12 days later.
When to worry:
- Under 3 months with ≥38°C fever — go straight to the doctor
- Fever lasts more than 48 hours
- Baby is very weak, hard to wake, or stops eating
- Seizure, difficulty breathing, rash, or growing redness around the vaccine site
Remember: focus on overall health more than the number. If baby is playful, feeding well, and pees normally, fever is usually fine. You can use cool cloth or ask your pharmacist or pediatrician about fever-reducing medicine (always ask for the dose). How old is baby and which vaccine?
Note: This isn't medical advice; always ask your doctor about medicine and doses.
⚕️ Health note: This answer is for general information only; it is not medical advice. Every baby is different — for decisions about your baby's health, consult your pediatrician.
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