what car seat for a 4 year old

For a 4‑year‑old in Australia, use an approved forward‑facing child seat (AS/NZS 1754) with an inbuilt 5‑point harness—unless they’ve outgrown it per the shoulder‑height markers.

If they have, move to a booster seat with a lap‑sash belt (never lap‑only) and always attach the top tether; ISOFIX or seatbelt install is fine if fitted correctly.

Keep them in the back seat, away from active front airbags, and tighten the harness so only two fingers fit at the collarbone.

Big coat off, straps flat, and follow the seat’s belt path exactly—no creative interpretations, Picasso.

If in doubt, a restraint‑fitting service can check it in minutes and save your nerves on every school run.