What should I do if my baby has a fever after vaccinations?

Low-grade fevers are a common and expected side effect of vaccinations, usually lasting 24 to 48 hours. However, it is essential to monitor your baby's behavior and feeding; if they are unusually lethargic, not feeding well, or if the fever is high (above 100.4°F), you should consult a pediatrician. Always use a standard digital thermometer for an accurate reading, ideally under the arm, rather than relying on infrared forehead thermometers.