A three-year-old boy was injured when he was crushed between a Land Rover and another car in a supermarket car park.
The boy suffered a fracture to one side of his skull in the crash at Morrisons in Exeter, police said.
His injuries are not life-threatening and he is expected to be sent to Bristol Royal Hospital for Children for further treatment.
Police have cordoned off part of the car park at the store in Prince Charles Road.
Emergency crews were called at 13:30 GMT after reports of an elderly driver hitting a tree and reversing into the parked vehicles.