How do I know if my child has outgrown this car seat?

Once your child exceeds any of the size requirements—weighing more than 10.0 kg (22 lbs), measuring more than 74 cm (29 in.) in height, or when the top of their head is less than 2.5 cm (1 in.) from the top of the car seat back—they MUST discontinue use of this child restraint. (Page 4)