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Which Car Seat Does My Baby Need?

Enter your baby's age and weight, get the exact car seat type required by EU R129 law, plus our top-rated picks for your market.

👥 Reviewed by the SBC Parent Panel, 7 European parents

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Weight matters for R129 compliance, height-based standard

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EU Car Seat Regulations: R129 i-Size Explained

The EU is transitioning from ECE R44 (the old weight-based standard) to R129 i-Size (the new height-based standard). Both are currently legal in all EU countries. For any new purchase, always buy R129 i-Size, it is safer and the future standard.

	R44 (old)	R129 / i-Size (new)
Based on	Weight groups	Baby's height
Rear-facing requirement	None, can forward-face from 9 kg	Mandatory rear-facing to 15 months
Side impact test	Not required	Required
ISOFIX	Optional	Mandatory
Buy for new child?	Only if no R129 option exists	✅ Always choose this

The most important safety fact: Rear-facing is 5× safer in frontal collisions than forward-facing. Keep your child rear-facing as long as the seat allows, ideally to the height limit of the seat (~4 years for most convertible seats).

Frequently asked questions

Can I use a car seat bought in another EU country?

Yes, any seat with R129 or R44 approval is legal in all EU member states. The approval number is printed on a label on the seat. If buying online from another market, verify the approval marking is present.

Can I buy a second-hand car seat?

Only if you know its full history, who owned it, whether it has been in any collision (even a minor one), and that it has never been dropped. Invisible structural damage from a collision makes a seat unsafe. If in doubt, buy new. Never buy a seat whose history you cannot verify.

Do I need to buy an infant seat or can I go straight to a convertible?

You can go directly to a convertible seat from birth, many are rated from 40 cm (newborn) and save you the cost of a separate infant seat. The advantage of an infant seat is portability (carry handle, clips to pram for a travel system). If you drive frequently and want to carry a sleeping baby from car to house without waking them, an infant seat is worth it. If you don't drive much, a convertible from birth is more economical.

How do I install a car seat correctly?

Always use ISOFIX connection points (rigid metal anchors between the seat cushion and backrest), significantly safer than seatbelt installation. Check your car's manual for ISOFIX position locations. After installation, the seat should not move more than 2–3 cm when pulled firmly at the top. Many fire stations and specialist baby retailers offer free installation checks, use them for your first seat.

Which Car Seat Does My Baby Need?

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EU Car Seat Regulations: R129 i-Size Explained

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