For children, vaccines are typically administered according to a specific schedule that spans from birth through adolescence. This schedule is designed to protect infants and children when they are most vulnerable to diseases. For instance, the Hepatitis B vaccine is often given within 24 hours of birth, while the Measles, Mumps, and Rubella (MMR) vaccine is usually administered at 12-15 months of age. Adhering to these timelines ensures that children develop immunity at the appropriate stages of their growth.