WHILE VEHICLE WAS AT A STAND STILL IT WAS REAR ENDED.THERE WAS A CHILD SITTING ON THE SECOND ROW OF SEATS RESTRAINED PROPERLY IN THE SEAT BELT.BUT WHEN THE COLLISION OCCURRED, THE SEAT BELTS DID NOT LOCK, THROWING THE CHILD INTO THE BACK OF THE FRONT PASSENGER'S SEAT AND THEN SHE BOUNCED BACK INTO HER SEAT.PLEASE PROVIDE ANY FUTHER INFORMATION. *AK