My baby got vaccinated yesterday and she had fever. Why did she have fever?

Fever and/or rashes are 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.