When are Booster Seats Required?

"Age 4 to 8, unless they're 4-feet 9 inches tall," State Patrol Trooper Cliff Pratt said. "Anything 4 feet 9 inches or taller should be in a safety belt."

In a booster seat, the "shoulder belt should cross the shoulder and the chest," Pratt said. "It should never be under the child or behind the back. The lap belt should rest low across the lap or upper thigh area, not across the stomach."

RCW section 46.61.687 has more details, available here.


Thank you to the Seattle PI's "Seattle 911"