What should be used for accurate weight calculations when infants occupy their own seat?

When calculating the weight for infants occupying their own seat, it is important to use the standard infant mass. This is because standard infant mass provides a specific benchmark that is used in aviation for safety and operational purposes. Infants have a substantially different body mass compared to adults, and using a standardized figure ensures that weight calculations are consistent and reliable for flight planning and safety assessments.

Standard child mass, while useful for older children, does not accurately reflect the weight of infants who are often lighter and require a different set of considerations for restraint systems and seating arrangements. Similarly, using adult mass or average mass for children would lead to inaccuracies since they do not represent the unique requirements and characteristics of infants using individual seating. Accurate weight calculations are crucial for ensuring proper balancing of the aircraft and compliance with safety regulations, hence the focus on standard infant mass.