A car seat belonging to Group 1/2/3 can avoid having to buy several car seats. With a single seat you can protect the your child for about 11 years (9 kg to 36 kg). We start using as a Group 1 seat (from 9 kg). Up to a weight of about 15/18 kg, the child is secured to the seat by the seat straps (or by a special ventral protection cushion) . When the child reaches about 15/18 kg in weight, the seat transforms into a seat belonging to Group 2 and the car seat belts are used to secure the child in the seat . Later, when the child reaches a weight of approximately 22 - 25 kg , the car seat transforms into a model belonging to Group 3 .