Since the approval of the AS1754:2010 Shoulder height markers have been added to all child restraints. The shoulder height markers make it easier for parents and carers to determine if a baby car seat is suitable for their child and when the child needs to move to the next type of restraint. On some restraints it will determine when the restraint needs to be changed to the next mode, such as moving from Rear facing to forward facing.   Convertible Caar Seat Height markers Untethered shoulder height markers Convertible booster seat height markers A4 Car seat height Markers Booster Seat Height Markers