Mild reactions to vaccines such as a low-grade fever and fussiness may occur but fortunately do not last long.
Although newborns may run a fever after receiving immunizations, check in with your pediatrician because any fever in a baby younger than 3 months should be evaluated. Some infants and toddlers will have a fever after their immunizations. Having a mild fever without any other symptoms is not dangerous. Give an appropriate dose of infant acetaminophen for a temperature above 100.4°F (38°C) or if your infant seems cranky. Your pediatrician may recommend a dose of acetaminophen just prior to the next set of vaccines or that you give acetaminophen as needed for the next 24 hours.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.