This is what I've read.
Fever is one of the possible reactions to some vaccinations. For example, after having the MMR vaccine, your child may develop a fever about one week after being vaccinated. And for chicken pox vaccine, your child may develop fever and rashes 1 to 2 weeks later. Usually, the nurse will provide approved fever medication and post vaccination advice on managing the common reactions to the vaccination.
If you baby’s fever persist after 24 hours or if he/she is persistently crying, have fits or have inflammation at the injection site, better bring your baby to the doctor for further checks.
You may what to ring up your doctor for some advice, or bring your baby down if he is still crying non stop. Really hope he feels better soon. :(
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