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The UK car seat guide: law, i-Size, ISOFIX and fitting

UK car seat law, i-Size vs R44, extended rear-facing, ISOFIX, the 2-hour rule and fitting checks, explained clearly for parents.

October 11, 2026
Child car seat fitted in the back of a car
2026Motherhood guide
The Motherhood guide to

UK car seats

The law, i-Size explained, rear-facing for longer, ISOFIX and fitting checks: everything you need to keep your child safe on every journey, from the drive home from hospital to the last booster seat.

If you only remember five things
  1. Children must normally use a child car seat until they are 12 years old or 135cm tall, whichever comes first.
  2. i-Size (R129) seats must keep your child rear-facing until they are over 15 months old.
  3. Never put a rear-facing seat in front of an active passenger airbag.
  4. Check the seat fits your car before you buy, using the manufacturer's vehicle fit list.
  5. Avoid second-hand seats unless you know their full history, and replace any seat that has been in a crash.
  1. The law in a nutshellAge, height, exceptions and fines
  2. i-Size R129 vs R44What the labels mean and what is still legal
  3. Seats by stageFrom baby carrier to booster
  4. Rear-facing for longerThe 15-month minimum and extended rear-facing
  5. ISOFIX, bases and vehicle fitSupport legs, top tethers and fit lists
  6. Airbags and fitting checksThe front seat rule and a checklist
  7. Journeys and the 2-hour ruleBreaks, travel systems and coats
  8. Boosters and bigger kidsHigh-backed boosters and booster cushions
  9. Second-hand seats and crashesWhen to say no and when to replace

If you’re trying to conceive (TTC), you probably know that there are certain foods and nutrients that become especially important once you’re pregnant. But nutrition plays a vital role even when trying to conceive, much like laying a strong foundation before constructing a house.

Certain nutrients create that foundation by supporting egg and sperm health (yes, nutrition matters for both partners), hormone balance and creating a hospitable environment for a fertilized egg to implant. In fact, studies show that certain nutrients can help increase fertility and improve success rates for both natural conception and fertility treatments.

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In other words, nutrition is a key player in the TTC journey, but getting the right nutrients in the right quantities can be tricky. That’s where supplements come in. Just as you’d take a multivitamin to fill in nutritional gaps for optimal health, fertility supplements can give you that extra nutrient boost.

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Choosing supplements for your fertility journey

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When choosing a supplement to support your fertility journey, look for science-backed, high-quality ingredients. Our editors are careful to select and partner with brands that use ingredients that have been clinically studied to support fertility. Eu Natural® (pronounced you) covers all those bases and more. We love knowing that Eu Natural® products contain zero artificial additives, binders, or fillers and are lab-tested to ensure purity and potency.

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Photobook: Luthier. Beeches Lane by &Something

When choosing a supplement to support your fertility journey, look for science-backed, high-quality ingredients. Our editors are careful to select and partner with brands that use ingredients that have been clinically studied to support fertility. Eu Natural® (pronounced you) covers all those bases and more. We love knowing that Eu Natural® products contain zero artificial additives, binders, or fillers and are lab-tested to ensure purity and potency.