What is the age limit for an infant as defined in aviation safety regulations?

The definition of an infant in aviation safety regulations typically refers to a child who has not yet reached their second birthday. This standard is important because it helps ensure that appropriate safety measures, such as the use of child restraints and seating arrangements on aircraft, are applied specifically to this age group. Infants require special considerations for their safety and well-being during air travel, and defining them as those not yet two years old establishes a clear age limit for regulations concerning their transportation.

Understanding this definition is crucial for pilots, flight attendants, and airline operators, as it directly affects how they prepare for and manage the safety of young passengers on flights. The other options provided either set the age limit too high or do not align with standard aviation definitions and practices regarding infant safety.