RE CENTURY INFANT SEAT SMARTFIT PLU MODEL # 4529STC, BABY'S HEAD SWINGS FROM SIDE TO SIDE WHILE SLEEPING BECAUSE ANGLE OF SEAT IS MORE OF A SITTING POSITION; AS A RESULT, BABY HAS PINCHED NERVE IN NECK AREA AND RECEIVING MEDICAL TREATMENT; ALSO BABY'S CHEEKS HAVE BRUISES FROM PLASTIC BUCKLES. *AK