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The minimum height requirement for a child to not need to be in a safety seat is specified at 48 inches. This means that once a child reaches this height, they are generally considered safe to use the standard seatbelt system in a vehicle rather than requiring a child safety seat.

This height requirement is based on safety regulations that are designed to ensure that seat belts fit properly across the child's body, providing adequate protection in the event of a crash. A proper fit helps to minimize the risk of injury by ensuring that the seatbelt remains positioned correctly across the child's lap and shoulder.

Children shorter than 48 inches may not be properly secured by an adult seatbelt, which would increase their risk in the event of an accident. Hence, the specification of this height reflects a consensus on children's safety in vehicle operation, emphasizing the need for appropriate restraints according to their size.