from the rta website, these laws are pretty much blanket through all states but WA.


"All children under seven years of age must be secured in a child restraint or booster seat when traveling in a vehicle. The new child restraint laws in NSW are based on national model legislation.
Babies up to six months of age must be restrained in a rearward facing restraint.
Children from six months to under four years of age must be restrained in a rearward facing or forward facing restraint. Children under four years of age must not be in the front row of a vehicle with two or more rows."





as long as you have a restraint point to clip the baby seat too there shouldnt be a problem.(a baby seat generally needs a seatbelt threaded through it and a strap that clips to the restraint point fitted in your car.
there are also different rules pertaining to different models of car seat so do your research and buy something to suit your needs.
also remember that a rearward facing seat cannot be used in the front seat of a car with passenger airbag.