A correctly chosen restraint that is incorrectly fitted offers far less protection than the label suggests. Australian research has repeatedly found that a large share of installed child restraints have at least one fitting error, and most are easy to correct once you know what to look for.
The five most common errors
1. A loose seatbelt or anchorage
The restraint should not move more than a small amount at the belt path when you grip it and push firmly side to side and front to back. If it shifts noticeably, the belt or ISOFIX connector needs tightening. Put your weight into the seat while you pull the belt through.
2. A twisted or slack top tether
Almost every forward-facing restraint in Australia uses a top tether strap anchored to a point in the vehicle. It must be flat, untwisted, attached to the correct anchor point, and pulled firm. A twisted strap loses strength, and a loose one allows significant forward head movement.
Check the anchor point is a genuine child restraint anchorage, not a cargo hook.
3. Harness slack
Use the pinch test. After buckling, try to pinch a horizontal fold of webbing at the child's shoulder. If you can gather a fold between your fingers, it is too loose. Tighten and test again.
4. Shoulder straps at the wrong height
Shoulder straps should sit at or just below the shoulders for rearward-facing, and at or just above for forward-facing. Re-check the height every few months, because children grow faster than we re-thread harnesses.
5. Bulky clothing under the harness
A puffer jacket compresses in a crash, leaving slack that was invisible when you buckled up. Take the coat off, buckle the child in, then lay the coat over the top.
Things that quietly cause problems
- Aftermarket accessories. Head supports, strap covers and seat protectors that did not come with the restraint have not been crash tested with it. Use only what the manufacturer supplies or approves.
- Toys hanging from the handle. Anything hard becomes a projectile.
- Recline angle. Rearward-facing restraints have an angle indicator. Too upright and a newborn's head can slump forward; too reclined and the restraint does not work as designed.
- Sagging over time. Belts loosen with use and temperature change. Re-check the installation every few weeks.
ISOFIX and seatbelt fitting
Neither method is inherently safer. ISOFIX is harder to get wrong, which is its real advantage. A seatbelt installation done correctly performs just as well. Whichever you use, the top tether is still required for forward-facing restraints in Australia.
Do not use both ISOFIX connectors and the seatbelt at the same time unless the manufacturer specifically permits it.
When to get professional help
Authorised restraint fitting stations operate across New South Wales, run by councils, motoring organisations and some retailers. A fitting check typically takes twenty minutes and costs very little. It is worth doing at least once, particularly for your first child or when you change cars.
Frequently asked questions
How do I know if my car has the right anchor points?
Check your vehicle handbook. Anchor points are marked with a child restraint symbol. If a seating position lacks one, a forward-facing restraint cannot legally be installed there.
Can I install a restraint in the middle rear seat?
Only if that position has both a suitable seatbelt and an accessible anchor point. Many vehicles do not.
Does the restraint need replacing after a crash?
Yes. Structural damage is often invisible. Contact your insurer, as replacement is frequently covered.
Talk it through with us
Our Peakhurst team can walk you through how a restraint fits your particular car before you buy.
General information only and not legal advice. For current requirements see your state or territory road authority and the National Child Restraint guidelines.