All children in Australia from birth to 7 years old must be in a approved child restraint seat while traveling in a vehicle.
All babies from birth to 6 months must be seat in a rearward facing position. They must use a baby capsule or an convertible car seat fitted in a rearward facing position.
You are permitted to travel with your child in a forward facing position from 6 months. However, it is highly recommended that you leave your child seat in the rear-facing position till at least 12 months and up to 30 months.
All children up to 4 years old must be seated in a fully harnessed child seat. That is, the 6 point harness that comes with the child car seat. You can use an convertible car seat in a forward position or use a convertible booster with the harness. There are also booster seats that are fully harness till 8 years old.
Child from 4 years old are permitted to use a booster with the vehicles seat belt. Please ensure your child is tall enough to use these boosters. It is recommended a child is to remain in a child restraint till the height of 145cm.