To provide your child with the best protection, the child’s ears shall be below the headrest upper edge. For Axkid Minikid, Axkid Rekid and Axkid Modukid, we recommend always using the unique headrest feature that makes the seat adapt to the child’s length and size. When unlocked, the car seat grows with your child and adjusts itself every time you use the seat. For Axkid Move and other seats in our product range we recommend checking regularly that the headrest is in correct position in relation to your child. Take a look at the instructions manual of your car seat for more information. For Axkid One we have added 2 stripes on the headrest that should be in the eye height of the child.