What evidence should a seller provide before I buy a used child car seat?

Is it safe to buy a pre-owned infant carrier from a family member?

The official answer starts from no and carves out one narrow exception. The Office for Product Safety and Standards says 'do not buy second-hand baby car seats as the structural integrity can be compromised by accidents and damage may not be visible'. RoSPA's Child Car Seats site says 'the best advice is do not buy a second-hand child seat', then: 'If you must use a second-hand seat, only accept one from a family member or friend (don't buy one from a second-hand shop, through the classified ads or online). Only accept one from a family member or friend if you are absolutely certain that you know its history, it comes with the original instructions and it is not too old.'

The Lullaby Trust goes further: 'Even if you know the history of the seat (for example, it's from a family member), wear and tear over time can affect the safety of a car seat, so it's still best to buy new.' Joie's i-Spin 360 manual says never to use a seat 'whose history you do not know'.

So a family member is not a green light. It is the only route RoSPA describes, with three conditions: you know the history yourself, the original instructions are present, and the seat is not too old by the maker's measure. The rest of this page is about testing those conditions.

RoSPA, Second-hand goods: "If you are getting a second-hand car seat or helmet from a relative or friend that you know well, and know the full history of the product and that it has not been subject to damage, then that is very different from buying it at a car boot sale where the seller may not be as honest about its history."

What evidence should a seller provide before I buy a used seat?

Ask for these in this order, before you travel. Each maps to a condition RoSPA, GOV.UK or the maker sets, and each is something a seller either has or does not.

1. 1
   Photographs of the underside labels The orange approval label (E in a circle, R129 or R44/04, model name, height or weight range) and the white product label with serial, batch and date. Every recent GOV.UK car-seat recall names its batch or serial and says it is on the underside. How to read them: the orange label decoder.
2. 2
   The original manual, or the exact model so you can download it RoSPA lists 'it comes with the original instructions' as a condition. Its FAQ says many makers publish manuals online; you need the model name from the label to find the right one.
3. 3
   Every part the manual lists Joie's parts list for the i-Spin 360 runs to nineteen items including the infant insert and harness pads; its manuals say 'DO NOT use this enhanced child restraint if it has damaged or missing parts' and not 'without the soft goods'. Ask for a photo of the seat with insert, pads, cover and any base.
4. 4
   The purchase date and place Some recall remedies are limited to a purchase window (Cuggl, 2408-0096). It also lets you test the seller's story against the year of production, which UN Regulation No. 129 requires to be marked on the seat.
5. 5
   A direct answer on crashes and drops Ask whether the seat has been in a car during any collision, including a low-speed one, and whether it has been dropped. RoSPA says a seat in a collision 'should be replaced, even if there is no visible damage'. You cannot verify the answer; decide how much you trust the person giving it.
6. 6
   The recall check, done by you Run the model and serial through GOV.UK, Safety Gate and the maker's page using the recall-records guide. A seller's 'never recalled' is not evidence.

What questions should I ask when buying a used booster seat?

High-back boosters are the seats most often passed on, because children use them for years. They raise their own questions.

1. Which standard and category? An R129 booster label reads 'i-Size booster seat' or 'Specific vehicle booster seat' (Britax Römer's FAQ describes both) with a range such as 100–150 cm. An R44 booster reads Group 2/3, 15–36 kg. GOV.UK accepts both; RoSPA accepts R44.04 or R44.03.
2. Is it a booster cushion? GOV.UK: manufacturers 'can now only make booster cushions approved as group 3', but existing group 2 cushions may still be used. A backless cushion has no back or side wings; RoSPA's checklist places cushions at 22–36 kg, roughly age six upwards.
3. How old is it, from first use? Britax Römer gives high-back boosters 12 years from first use; Cybex's Solution G i-Fix manual says 'do not use this car seat for more than 11 years'. Ask when it was first used, not just when it was bought.
4. Do the belt guides and headrest still work? The child is held by the car's belt, routed through the seat's guides. Ask for a video of the headrest ratcheting and the guides intact; Cybex tells owners to check plastic parts for 'change of shape or colour'.
5. Does it fit the car and the child? 'Specific vehicle' boosters need your car on the maker's type list; RoSPA's checklist says 'if you cannot get it to fit securely, do not buy it'. GOV.UK: a seat is required until 12 years old or 135 cm; measure the child against the label range rather than trusting the age on the listing.

How can I verify crash history, ownership and storage conditions?

Mostly, you cannot. RoSPA: 'When you buy a second-hand car seat, crash helmet, cycling helmet or riding helmet, in most cases, you cannot know for sure if it has been damaged.' What you can do is look for evidence that is hard to fake and easy to check.

• Insurance trail. RoSPA tells parents to 'include the replacement cost in any insurance claim' after a collision. Ask directly whether the seller's car has been in an accident with the seat fitted.
• Ownership. A registration confirmation from the maker, a retailer order email or a receipt ties the seat to the seller and gives you the purchase date. It proves who has had it, not what has happened to it.
• Storage. Cybex's manuals say a seat left in strong sunlight 'must be removed from the vehicle or covered', and that owners should check 'all plastic and metal parts of the seat regularly for damage or change of shape or colour'. Faded, chalky plastic and a label bleached to pink are storage evidence you can see.
• Wear you can feel. Press and release the buckle several times. Two recent GOV.UK recalls are about exactly this: the Halfords Nyala buckle 'may become deformed' in heat; the Puggle harness may not lock 'properly when pulled'. Pull the harness through the adjuster; it should run evenly on both sides.

None of these substitutes for knowing the history. They clear the checks that can be cleared; the one that cannot is the one RoSPA weights most.

How much does a new seat cost compared with a used one?

Before you pay for a used seat, know the new price of the same class. Marketplace asking prices vary too much to tabulate honestly, so MayTally does not publish them; the new prices below were read from three UK retailers on 9 September 2026.

Set that against the used offer. A £50 i-Size infant carrier with no receipt, no insert and an unknown history is competing with a £105 new one that arrives with its manual, all its parts, a retailer to return it to and a two-year warranty (Joie's, extendable to three on registration). A £30 high-back booster is competing with a £59.99 new one. RoSPA: 'it is not necessary to buy the most expensive one', and your council's Road Safety Department may know of 'child seat discount schemes'.

When should I walk away even if the price is low?

Where can a used seat be reasonable? Only within RoSPA's own boundary: from a family member or friend, history known to you, original instructions and every part present, within the maker's stated life where one exists, label read and recall check run. That describes the conditions, not a verdict. The Lullaby Trust's view is that even then new is better. Neither body describes any used seat as fit to use, and nor does this page.

In shortAsk for the underside photographs first, the manual and parts second, the purchase date and crash answer third, and run the recall check yourself. Then price it against new: £60 for a high-back booster, around £100 for an infant carrier or toddler seat. If the seller is not someone whose account of the seat's history you would stake your child on, RoSPA's advice is already written: do not buy it.