CENTURY MODEL 4331-RCK, DOM 02-10-99; 3- WEEK INFANT WAS IN THE SEAT , REAR FACING WITH LEVEL INDICATOR INDICTATING LEVEL WAS CORRECT, BUT INFANT'S HEAD WAS STILL LEANING FAR TOO MUCH OVER, CUTTING AIR FROM THE WINDPIPE . INFANT STOPPED BREATHING AND WAS RUSHED TO THE HOSPITAL. *AK