Children should use a booster seat until they outgrow it. An adult lap/sash seatbelt is designed for people with a minimum height of 145cm. Children who use an adult seatbelt too early are 3.5 times more likely to sustain a significant injury in a crash.
There are two types of booster seat available:
- Single purpose booster seats with a back - designed to be used with a lap/sash seatbelt and may or may not have a top tether
- Forward facing restraint/booster combinations - used as a forward facing restraint until at least age 4, then the seat can be used as a booster with a lap/sash belt.
Booster cushions were removed from the 2010 Australian Child Restraint Standard and are no longer manufactured, but are available on the second-hand market. They are not recommended for use because of safety concerns. Booster cushions do not offer side or head protection in a crash.