Infants and children under what age must be in a "carry cot" secured by a seat belt?

The correct answer is 2 years. In many jurisdictions, safety regulations require that infants and children under 2 years old use a properly secured carry cot or an appropriate child safety seat while traveling in a vehicle. This rule is in place because children at this age are particularly vulnerable in the event of a crash due to their size and development.

Using a carry cot or seat that meets safety standards ensures that the child is adequately protected, as these restraints are designed to minimize movement during a sudden stop or collision. As children grow and develop, the type of restraint required can change, which is why these laws typically set specific age limits to ensure the appropriate safety measures are in place for different developmental stages.

It's important to note that the age categories for safety restraints help to provide a framework for ensuring that all children are safely secured according to their size and weight. As they grow older, they may transition to booster seats or seat belts, but until they reach 2 years of age, a secure carry cot is the safest option.