How long can you use a infant car seat?
Short answer: Typically from birth for car journeys. Always go by the age, weight and development limits in the instructions for your model.
Product limits vary, so check the instructions and the product page.
- 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
- It is fine for a baby to fall asleep in a car seat while you travel, but take them out as soon as you arrive.
- 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
- Radial i-Size Plus 360 Spin 40-150cm Car Seat
- Nimbus 180° Spin i-Size Car Seat
- Venus Prime Jogger Stroller & Rotating Group 0+/1/2 ISOFIX Car Seat
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
How long can you use a pushchair?Is a stroller right for you? Quick quizIs a stroller safe for a newborn?Is a pushchair right for you? Quick quizIs a pushchair right for you? Quick quizIs a double pushchair right for you? Quick quizAll prams, pushchairs and travel systems advice →
Sources
- NHS: Sudden infant death syndrome (SIDS) (accessed 2026-10-21)
- 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.