The group 0/1/2/3 seat is a universal seat for children weighing up to 36 kg and is designed for the entire duration of the mandatory use of the child seat, i.e. up to 12 years of age. This type of seat is equipped with a padded insert for the youngest children, to best suit the different sizes of children. These seats are equipped with various types of adjustment and the possibility of tilting and widening the backrest in the shoulder area. They also have internal harnesses, usually 5-point harnesses, which are disassembled and replaced by car seat belts depending on the weight of the child and the model of the seat. As standard for this weight group, the seats are equipped with a movable headrest, which allows for perfect adjustment of the height to the child's height. This ensures that the child's head is properly protected during an accident and the risk of injury is minimised.