What’s the law on car seats?

By UK law, all children must use the correct child car seat or booster seat until they are either 135cm in height or 12 years old, whichever comes first.

Make sure to have a car seat ready before your little one is born, as you won't be able to drive them home without one.

It is illegal to use a rearward-facing child car seat in a passenger seat protected by a front airbag.

Which car seat group is right for my child?

Make sure your child is in a car seat suitable for their weight or size:

Weight Age* (approx.) Type Buying Tip
(Birth - 29lb)
0 - 12 months
Rearward-facing infant seat
Look out for models that can connect to travel systems.
(Birth - 40lb)
0 - 4 years
Rearward to forward facing seat
Try to choose one with extended rear-facing travel.
(Birth - 5st 9lb)
0 - 12 years
Infant seat to high-back booster
An all-in-one choice that lasts from birth to 12 years
(20lb - 5st 9lb)
9kg - 12 years
High-back booster with harness
Adjustable features help these grow with your child
(33lb - 5st 9lb)
4 - 12 years
High-back booster without harness
Perfect for older children who need a boost

Good Egg Safety carried out a survey of 2,351 children to find out if kids are in the right car seats.

  • Age 2-3: Over 50% were in the wrong type of car seat
  • Age 8-11: 34% only used an adult seat belt

Using the wrong type of restraint puts children at greater risk of injury in the event of an accident. If you’re not sure which car seat meets your child’s needs, you can ask our in-store Baby Advisors.

Some tech talk explained…

Extended rearward facing

Keeps baby travelling rearward facing up to 18kg, reducing the risk of injury in a head-on collision by more than 73% compared to a conventional forward facing seat.


Attachment points in a car, providing a solid and permanent connection between car seat and car body. This is the safest, easiest and quickest way to fit a car seat correctly. We have a wide range of ISOFix compatible seats in every group.

Car seat base

Allows safe, quick and easy installation of car seats using ISOFix anchor points or the vehicle seat belt.

Belt fitted

A car seat secured using your vehicle’s 3-point seat belt.

Side impact protection

Deeper side wings ensuring optimum protection should your car be involved in a side-on collision.

Top tether

A tether on the back of the car seat. When hooked and tightened to the tether points in your car it helps keep the car seat from tipping forward in a crash.

Support leg

Extends to the vehicle’s floor for extra stability. Please check whether the support leg rests on an under floor storage compartment in your car, as this may be unsafe.


Straps that keep a child secured in the car seat in case of a crash. The safest harness is a 5-point harness that secures the child at the shoulders and hips, and buckles between the legs.

iSize (ECE R129)

A 2013 European safety regulation regarding car seats for children under 105cm (approx. 4 years). This does not replace the current ECE R44/04standard. For increased safety and ease of use, iSize car seats are:

  • Categorised by height and size rather than height and weight.
  • Rearward-facing until at least 15 months.
  • Only installed using ISOFix to reduce risk of misuse.
  • Side-impact tested as standard.
  • Not categorised by groups.
  • Designed to fit any iSize approved vehicle.

Safety Tips

  • Check the safety label. It should feature an E mark and read 44/04 or R12.
  • Never buy a second-hand car seat. There will be no record of whether the seat was damaged in an accident.
  • Only move your child out of rearward facing car seats when their head has crowned the top of the seat or they reach the maximum weight outlined by the manufacturer.
  • Children under 3 years should not be kept in a car seat for over 2 hours.
  • Avoid putting your child in bulky clothing when travelling. If you can fit more than 2 fingers under the safety harness, it needs to be tightened.
  • To avoid buckle crunch, the belt buckle of the car seat should be positioned down the side of the seat, with only the straps touching the frame.

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