VEHICLE WAS INVOLVED IN A REAR END COLLISION AT 40 MPH. DRIVER'S SIDE SEATBACK COLLAPSED ON IMPACT ONTO A SMALL CHILD SITTING IN CHILD SAFETY SEAT IN REAR. CONSUMER FELT IT WAS DANGEROUS FOR SEAT TO COLLAPSE ON A SMALL CHILD. *AK THE SEAT DID NOT SUPPORT CONSUMER WHO SUSTAINED INJURIES TO THE BACK. THE CHILD HOWEVER WAS NOT INJURED. *JG