Is your old car seat still legal to use?

So what happened in 2023 and 2024?

Two things, both about selling rather than using. Europe has had two safety standards for child car seats running side by side for years — an older one and a newer, stricter one. From September 2023, new seat designs stopped being approved under the older standard: everything designed from then on has to meet the newer one. Shops were given a year to clear the stock already sitting in warehouses, which ran out in September 2024.

That is the whole story. One date closed the door to new designs, the other emptied the shelves. Neither says a word about the seat in the back of your car.

If you want to know which of the two your seat was built to, look at the orange label on its side. A code beginning R44 is the older standard; R129, often sold as “i-Size”, is the newer one. That is the only place in this article those codes matter — they are a way of identifying your seat, not something you need to understand.

Then why does everyone say the old seats are banned?

Because “you can’t buy these any more” is one short retelling away from “you can’t use these any more”, and the second version is far more alarming, so it travels further. If someone tells you your seat became illegal in September 2024, they are describing a shop’s obligation as though it were yours.

What the newer standard genuinely does better

None of this makes an older seat unsafe. It does mean a newer one starts from a better place:

• It is crash-tested from the side. Older approval involved no side impact test at all. The newer one adds one, and what it measures is whether the child’s head stays inside the shell instead of reaching the door. This is the real difference, and it is about protection rather than paperwork.
• Rear-facing until at least 15 months is required, not advised. Under the old rules a 9 kg child could legally be turned to face forward, which in practice meant some babies were turned at nine or ten months. Newer seats even have to carry a warning on the box saying not to use them facing forward before 15 months.
• It sizes seats by height, not weight. Height is what decides whether a child’s head is still protected by the shell, so it is the more useful number — see what size seat your child needs now.
• The newer seats clamp to the car. Instead of being held by the adult seat belt, they lock into fixed metal anchor points built into the car seat cushion, with a leg or a strap stopping them tipping. That quietly removes a whole family of mistakes: you cannot fit a clamped-in seat with a slack belt routed through the wrong slot.

That last point has a catch worth knowing before you spend money. Those anchor points are not usable in every car and in every seating position, so a newer seat is not automatically a better fit in your car. See the three ways a seat can be attached.

So should you replace it?

On the standard alone, no. There are four reasons that have nothing to do with it:

• it is past the expiry date stamped on the shell — where to find yours;
• you cannot account for its history, because it came second-hand or may have been in a crash — what to check;
• your child has genuinely outgrown it, rather than outgrown its current adjustment — how to tell;
• it only faces forward and your child is still small enough that staying rear-facing is the safer choice. Rear-facing is allowed at any age, and there is no upside to hurrying — when to turn the seat around.

The thing that matters more than the label

Swapping an older seat for a newer one changes less than fitting either one properly. A newer approval does not compensate for a harness two fingers loose, a chest clip sitting on the belly, or straps threaded a slot too low — and those are what technicians actually find at roadside checks, in seat after seat.

If you only have time for one thing after reading this, do the two-minute checks in Setup & fit. They will do more for your child than any label will.

Two questions that come up next

Can I take an older seat on a plane? That is a separate approval entirely, and it has nothing to do with the European code on the side of the shell — an airline cares whether the seat is certified for use on aircraft, which is printed as its own label. See flying with a car seat.

Should I accept a hand-me-down seat? Its age is not the problem. The problem is that you cannot see a crash in a plastic shell, and a seat that has been in one has to be retired even if it looks perfect. If you know and trust the history, and it is inside its expiry date with all its parts and labels, it is a usable seat. If the history is a shrug, decline it — this is the one piece of baby equipment where second-hand is genuinely a gamble. See what to check on a used seat.