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Taking your child out and about in the car should be a safe, easy and enjoyable experience. But with so much information out there, and so many things to consider, choosing a car seat can be confusing. In this car seat guide, we’ll try to explain the latest regulations to make them easier to understand, highlight any further features that you and your child may benefit from, and ultimately help you find the right car seat for your child (and your car).

Understanding car seat regulations

There are currently two ways to choose a car seat: By using the older regulation R44.04 which is based on your child’s weight (these are categorised by “Groups”) or by using the latest R129 regulation which is based on your child’s height. R129 seats are often referred to as i-Size car seats.

My Babiie black i-Size spin car seat.

What are the legal requirements for car seats?

  • By law children in the UK need to be in their own car seat from birth until they are 135cm tall or 12 years old, whichever comes first.
  • Height-based R129 seats must be rear-facing until your little one is over 15 months old. Rear-facing travel is safer for babies and young children as it helps to protect their heads and necks more than forward-facing.
  • If selecting a height-based car seat, please make sure it is EU approved. Check for the orange label showing a capital ‘E’ in a circle and ‘R129’.
  • Weight-based seats are grouped by weight brackets or “Groups”. Make sure you pick only EU-approved weight-based child car seats. These too have a label showing a capital ‘E’ in a circle and ‘ECE R44’.
  • As of September 2024, R129 will become the only Legal Regulation for car seats in the UK, replacing R44.
Joie Stages FX Group 0+/1/2 Car Seat.

How to fit a car seat and where to put it

  • There are two ways to install or fit a car seat depending on how they are specifically designed: either by using the car’s lap and diagonal seat belt, or by using your car’s built-in ISOFIX anchor points. Not all cars have ISOFIX so you will need to check with your car’s manufacturer.
  • Be aware, it's illegal to use a rear-facing car seat in the front passenger seat if there is an active airbag. It's also very dangerous even if it's a forward-facing car seat, so it’s always best to keep children in the back seat if possible.
  • If you have to use a forward-facing car seat in the front passenger seat, try to move the passenger seat as far back as it can go.

Understanding ISOFIX, R129 & i-Size car seats

The i-Size logo and car seat.

R129 & i-Size car seats

R129 is the European Regulation for car seats which came into force in the UK in 2013. 

R129 seats go by the child's height, instead of their weight. Because of this, R129 seats allow your child to be rear-facing for longer and offer more protection if your car is involved in a collision.

Some R129 car seats are also known as i-Size seats which means that they have been developed to work with the ISOFIX system. But not all R129 seats are i-Size, so check carefully. Look for the i-Size icon on your car’s rear seats and on your child’s car seat to see if they are compatible.

Rear car seat with ISOFIX anchoring points for child car seat.

What is ISOFIX?

Many of our car seats are compatible with ISOFIX, which is designed to make fitting a car seat safer and easier, with less risk of incorrect installation.

ISOFIX uses two anchoring points built into the base of your car's seats. An ISOFIX compatible car seat has two bars that connect onto these points.

My Babiie infant carrier with base.

What is an ISOFIX base?

Many baby car seats are compatible with an ISOFIX base. This allows you to click the car seat on and off the base with ease.

You can purchase the ISOFIX base separately to click into your ISOFIX-compatible car. Not all seats match all bases - make sure that the base you choose is compatible with your car seat before you buy.

An ISOFIX car seat with a top tether.

Additional support

Some ISOFIX car seats include an additional support leg that stands on the car floor or a top tether that attaches to the back of the seat to prevent it tilting or rotating in a collision.

Not sure if your car has ISOFIX? You should be able to find out by checking your car's back seats, reading your vehicle handbook or looking on the car maker's website.

Find the right car seat for your child

To help you find the right car seat for your child, we have now grouped all our car seats by approximate child age group and minimum child height. From travel system car seats for newborn babies to backless booster seats for older children, we have a car seat for every height and age.

Joie Juva classic group 0+ baby car seat.

Child height: 40-85cm

Approximate age: birth up to 12-15 months

Child weight: birth up to 13kg/29lb

Group 0+

  • Designed for newborns.
  • Lightweight with carry handles.
  • Essential for coming home from hospital.
Joie spin Gti 360 car seat.

Child height: 40-105cm

Approximate age: birth up to 4 years

Child weight: birth up to 18kg/40lb

Group 0+ & 1

  • The flexible choice.
  • For babies & toddlers.
  • Not designed to be carried.
Graco SlimFit group 0+/1/2/3 car seat.

Child height: 40-150cm

Approximate age: birth up to 12 years

Child weight: birth up to 36kg/79lb

Group 0+, 1, 2 & 3

  • 4 seats in 1.
  • Adjusts to fit from newborn baby to child.
  • Not designed to be carried.
Harmony Vybe deluxe group 1/2/3 car seat.

Child height: 85-105cm

Approximate age: Approx 9 months to 4 years

Child weight: 9-36kg/20-79lb

Group 1,2 & 3

  • For older babies upwards.
  • Adjusts to fit as they grow.
  • Not designed to be carried.
Graco Junior Maxi group 2/3 car seat.

Child height: 100-150cm

Approximate age: Approx 4-12 years

Child weight: 15-36kg/33-79lb

Group 2 & 3

  • Booster seats for children.
  • Lightweight and easy to fit.
  • Often come with cup holders.

Please note that not all car seats may fit into these size ranges. The car seat manufacturer will advise and label them accordingly.

Ickle Bubba Stomp Luxe i-Size, Isofix travel system.

Travel systems with car seats for newborns

Child height: 40-87cm

Approximate age: birth up to 12-15 months

Child weight: birth up to 13kg/29lb

Group 0+

  • Complete sets of pushchair/pram and car seat.
  • Includes matching accessories.
  • Great value.
Britax Romer Discovery Plus Isofix car seat.

Booster seats for older children

Child height: 100-150cm (Booster seats with backs can be used for 100cm+, Backless boosters are for 125cm+)

Approximate age: Approx 4-12 years

Child weight: 15-36kg/33-79lb

Group 2 & 3

  • Booster seats for children.
  • Lightweight and easy to fit.
  • Often come with cup holders.

Top 3 things to remember when choosing a car seat

1. Safety regulations

Your child seat must conform to EU R44 or the new i-Size regulation R129. Look for the ‘E’ mark label on the seat.

2. Choose the right size

Your child seat must be suitable for your child’s height, weight and size.

3. Fit it correctly

Your child seat must be correctly fitted according to the manufacturer’s instructions.

Some more safety tips

Never buy a second-hand car seat. While it might save you money, you can’t always tell if it's been damaged or in an accident. Using a second-hand car seat can put your child in danger.

Avoid keeping a baby in an infant carrier for prolonged periods of time as it can damage their back. Take regular breaks and get your child out of the seat when safe to do so.

Remove thick clothing from your child when using a car seat so that the belts can be tightened securely around their body. If you can pinch the straps of the harness together with your fingers then it’s not tight enough.

If using the car's seatbelt to secure the car seat, and to avoid "buckle crunch", make sure the buckle is not touching the frame of the car seat. Any pressure on the buckle could cause the seatbelt to come loose and the car seat won't be secure.

Best car seat reviews

In the car with baby

Baby playing with a Benbat Double Sided Car Arch.

Baby car toys

Keep baby entertained on boring car journeys. Brightly coloured and engaging baby car toys often attach to the headrest for the back seat or the car seat, and we've included some portable toys too.

A girl looking out through a Dreambaby Car Window Shade/Socks.

Mirrors and window sun shades

Calm and soothe your little one with cooling window shades and headrest mirrors to reassure and relax on longer car journeys. Great for bringing on the zzzzs.

Need more help?

 If you’re still unsure, these frequently asked questions might help:

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