LEE'S SUMMIT, Mo. (AP) — Police are investigating how a 1-year-old child fell out of a moving car on a Missouri highway.

The child suffered only minor injuries after falling out of the car Sunday night in Lee's Summit. A passing driver stopped immediately and helped the child until emergency crews arrived.

Police say the driver told officers that the child fell out of a rear passenger door when the car turned onto an entrance ramp for U.S. 50 in the Kansas City suburb.

Officers are trying to determine if the child was sitting in a child's car seat that was in the vehicle.