Child restraint rules in Australia are consistent across states and territories, but they are written in legal language that is easy to misread. Here is the same information in plain English.
One rule underpins all the others
Any child restraint used in Australia must be approved to the standard AS/NZS 1754 and must be properly fastened and adjusted. Seats bought overseas, including from the United States or Europe, are not legal for use here, even if they are excellent seats. Check for the standards label before anything else.
Age by age
Birth to 6 months
A rearward-facing restraint with an inbuilt harness. This includes infant capsules and convertible seats used in the rearward-facing position.
6 months to 4 years
Either rearward-facing or forward-facing, with an inbuilt harness. The law permits the change at six months; safety guidance encourages keeping a child rearward-facing for as long as they fit within the seat's shoulder height markers. Rearward-facing offers significantly better protection for the head and neck.
4 to 7 years
A forward-facing restraint with an inbuilt harness, or a booster seat used with a correctly positioned lap-sash seatbelt.
7 years and over
A booster seat or an adult seatbelt. Legally permitted does not mean ready, and many children still need a booster well past seven.
Front seat restrictions
- Under 4: cannot travel in the front seat of a vehicle with two or more rows.
- 4 to 7: cannot travel in the front seat unless all other rear seats are already occupied by children under seven.
The shoulder height markers matter more than the birthday
Australian restraints carry marked shoulder height lines. These, not your child's age, tell you when to move on. A child should stay in their current restraint until their shoulders pass the upper marker. Moving up early is a common and avoidable mistake.
The five-step test for seatbelt readiness
Before a child moves out of a booster, check all five:
- They can sit right back against the seat back
- Their knees bend comfortably over the seat edge
- The sash belt sits across the middle of the shoulder, not the neck
- The lap belt sits low across the hips, not the stomach
- They can hold this position for the whole trip without slouching
If any answer is no, keep the booster.
Fitting is where most errors happen
Australian studies have repeatedly found that a large proportion of installed child restraints have some kind of fitting error. The frequent ones are a loose seatbelt or anchorage, a twisted top tether strap, and harness slack. The harness should be snug enough that you cannot pinch a horizontal fold of webbing at the shoulder.
Bulky jackets under a harness create hidden slack. Remove the coat, buckle the child in, then place the coat over the top.
If you are unsure, use an authorised restraint fitting service. Many councils and motoring organisations offer them, and it is money well spent.
Frequently asked questions
Are second-hand car seats legal?
They are legal if they meet AS/NZS 1754, but only use one if you know its full history. A seat that has been in a crash must be replaced, and damage is often invisible. Check the expiry date moulded into the shell, as most seats are rated for about ten years.
Do the rules differ between states?
The core age-based rules are national. Some enforcement details vary, so check your state road authority for specifics.
Capsule or convertible seat?
A capsule is easier to carry and clicks into a pram, but is outgrown in months. A convertible seat lasts far longer but stays in the car. Many families use a capsule first, then move to a convertible.
See the options in person
Babyworth stocks capsules, convertible seats and boosters from established Australian brands. Visit our Peakhurst showroom to check fit and compare.
General information only and not legal advice. For current requirements, check your state or territory road authority and the National Child Restraint guidelines.