Which car seat standard should I look for?
Short answer: R129 (i-Size), or R44.04 (or R44.03) on older models, shown by the 'E' mark label.
Here is the detail behind that answer, taken from current UK guidance from the NHS and the Lullaby Trust.
Things to check
- Look for R129 (i-Size) or R44.04 approval and the E mark.
- Check the fit in your car and whether you need an ISOFIX base.
- Take your baby out when you arrive, as the NHS advises.
What the guidance says
- Car seats: look for ECE R44.04 (or R44.03) or i-Size R129, shown by the 'E' mark label.
Related questions
What is a infant car seat?
A rear-facing car seat for newborns, often clicking onto a pushchair.
Shop at Baby Kingdom
- Cirrus i-Size Car Seat
- Nimbus 180° Spin i-Size Car Seat
- Venus Prime Jogger Stroller & Rotating Group 0+/1/2 ISOFIX Car Seat
- Radial i-Size Plus 360 Spin 40-150cm Car Seat
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can a 1 year old sleep in a car seat?Can a 2 month old sleep in a car seat?Can a 10 month old sleep in a car seat?Double and tandem pushchairs buying guide for UK parentsIs a carrycot right for you? Quick quizGuide to car seats: what to look forAll prams, pushchairs and travel systems advice →
Sources
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.