What is an example of preventive medicine for children?

The choice focusing on ensuring vaccinations are up-to-date is an excellent example of preventive medicine for children because vaccinations protect against various infectious diseases that can have significant health impacts. By receiving vaccinations according to the recommended schedule, children develop immunity to diseases such as measles, mumps, rubella, and polio. This preventive measure helps not only to safeguard the individual child from illness but also contributes to community immunity, protecting those who cannot be vaccinated due to medical conditions.

The other options, while important for a child's overall health and well-being, do not fit as directly under the umbrella of preventive medicine. Regular check-ups are a key part of monitoring a child's health and identifying potential issues early, but they are more about ongoing health maintenance rather than prevention. Being active and eating healthy are essential lifestyle habits that contribute to long-term health, but they do not prevent specific diseases in the same targeted way that vaccinations do.