What are the laws relating to kids and cars in Australia?

The new child restraint laws are now in effect. Here is a quick guide for parents:

If your child is:He or she should be restrained in:
Birth up to 6 monthsRearward facing child restraint with an inbuilt harness
6 months up to 4 years of ageRearward or forward facing child restraint with an inbuilt harness
4 years up to 7 years of ageForward facing child restraint with an inbuilt harness or a booster seat
Over 7 years of ageBooster seat with either an accessory harness or standard car seat belt

New laws have been passed that make it mandatory for children under seven to be restrained in an appropriate child restraint. These laws are designed to increase the safety of your children and reduce the number of children injured or killed in car accidents.