European rules run on height under i-Size rather than the weight-based system they replaced, and both are still on the road. See which applies to your seat and what is required where you are travelling.
EU Car Seat Laws — Check ECE R129 / i-Size Compliance
i-Size (ECE R129) replaced ECE R44/04 for new seats in Europe. If your seat is pre-2023, you need to know what’s still legal.
Select your country and child’s height. The checker applies ECE R129 i-Size requirements and confirms which seat group your child must use.
Non-compliant child restraints are illegal across EU member states and the UK. New i-Size rules are height-based, not weight-based — a common point of confusion.
Parents driving in EU countries, UK residents, and families relocating between countries.
- ECE R129 (i-Size) — Sept 2024
- EU Regulation 2019/2144
- UK Road Traffic Act 1988
- ECE R44/04 (legacy)
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.