Booster seats are required by law for children over 18 kg (40 lbs.) up to 36.3 kg (80 lbs.).
Booster seats position the adult seat belt correctly over a child's chest and hip bones, which are the strongest parts of the body.
A “no-back booster seat ” can be used if your vehicle seat provides your child with head and neck support. If this booster seat raises your child so the middle of the ear is above the back of the vehicle seat and head-rest, a “high-back booster” seat is recommended.