Every stage™ fx is a 4 stage in 1, (group 0+/1/2/3) bidirectional growth child car seat. It adopts a growth design with AutoAdjust™ function to allow the width of the side wings to be adjusted with the height of the headrest. High and open and Grow Together™ ten-segment headrest height adjustment system can directly drive the height of the shoulder strap. Use the ISOFIX interface to make the installation more stable and easy (ISOFIX installation is suitable for 15-36kg children (group 2/3) when the growth type safety seat mode)