Buying guides

Car Seats Buying Guide Hero


Looking for a car seat that’s the right fit for your child? Your child’s weight or height, not age, is the key factor when deciding which car seat is suitable and safe.

By law, all children under 135cm tall or under 12 years of age must have their own car seat. All the car seats in our range are designed to give your child the best possible protection and meet the current safety regulations as set out in ECE R44.04 and R129.

It’s recommended that a child continues to use a rear-facing car seat until they are at least 15 months old (this is mandatory if you select a R129 car seat). This is because a child’s body below this age is particularly vulnerable to forceful impacts and a rear-facing seat will provide additional protection.  

We also offer a car seat fitting demonstration service in most of our shops. Click here to find out more

RoSPA has produced a useful series of videos on car seat safety - view them here.

Shop car seats here



Child's weight*

Approx. age of child

Child's height¹


Birth - 10kg/22lb

Birth to 6 - 9 months

40 - 85cm


Birth - 13kg/29lb

Birth to 12 - 15 months

40 - 85cm

0+ and 1

Birth - 18kg/40lb

Birth to 4 years

40 - 105cm
0+, 1, 2 and 3 Birth - 36kg/79lb Birth to 12 years 40 - 150cm


9 - 18kg/20 - 40lb

9 months to 4 years

85 - 105cm

1 and 2

9 - 25kg/20 - 55lb

9 months to 6 years

85 - 150cm


15 - 25kg/33 - 55lb

4 to 6 years

105 - 150cm

1, 2 and 3

9 - 36kg/20 - 79lb

9 months to 12 years

85 - 150cm

2 and 3

15 - 36kg/33 - 79lb

4 to 12 years

105 - 150cm
  *Applies to R44.04 seats   ¹Applies to iSize seats


If you have a newborn baby or a child weighing up to 13kg/29lb

Then opt for a Group 0+ car set because…

  • They are rear-facing, which is the safest way for babies to travel
  • Many models can be used with Isofix fittings, so you don’t need to use a seatbelt
  • They feature a carry handle, which is useful for transporting a sleeping baby from the car) and curved base for gentle rocking
  • Comfort extras include cushions, head-huggers and padded straps
A group 0+ car seat

If you have a newborn baby or child weighing up to 18kg/40lb

Then go for a Group 0+ and 1 car seat because…

  • This style is approved across two categories and easily adjusts as your child grows
  • Most models have a reclining mechanism for added comfort
  • Features include padded, washable seat covers that can be easily removed
A group 1 car seat

If you have a child weighing 9-36kg/20-79lb

Then select a Group 1, 2 and 3 car seat because…

  • They’re a lasting option, adapting as your child grows
  • They convert to a high back booster seat – ideal for older children until they can safely use an adult seatbelt
  • They feature cushioned seat and supports to keep your child safe and comfortable
A group 1,2 and 3 car seat

If you have a child weighing 15-36kg/33-79lb

Then a good option is a Group 2 and 3 car seat because…

  • They are booster seats designed specifically for older children until they can safely use an adult seatbelt.
  • They have adjustable height, width and leg rest options
  • Features can include cup holders and even speakers in the headrest
A group 2/3 car seat


  • To ensure your child’s safety in a car, it is important that you choose the right car seat and fit it correctly

  • Don’t leave even the shortest journey to chance: always take the time to harness your child in an appropriate car seat

  • Until they’re 12 years old or 135 centimetres tall, whichever comes first, children must normally use a child car seat appropriate for their weight in any vehicle (including vans and other goods vehicles)

  • Rear-facing baby seats must not be used in a seat protected by a frontal airbag unless the airbag has been deactivated manually or automatically

  • Always follow the manufacturer’s fitting instructions and keep them with the seat

  • Our Partners are trained to advise you on the right type of seat for your child and for your car


Manufacturers are no longer allowed to produce backless booster seats for children shorter than 125cm or weighing less than 22kg.

These regulations, in force since February 2017, are designed to improve road safety for smaller children. Seats with backs are deemed safer as they offer better side impact protection.

Consider changing your booster seat or cushion to a car seat with a back, since they’re deemed to offer better protection to smaller children. Models that are currently in the marketplace can continue to be sold and any existing seats you own can still be used in accordance with government guidelines, provided they have the standard safety mark ECE R44.


Free Standard Delivery

If you spend £50 or more on a car seat, we offer free Standard delivery to your home.

Click & Collect

If you’d prefer to pick up your new car seat in store, use Click & collect from John Lewis & Partners and Waitrose & Partners. It’s free on orders of £30 and over.


Bored children may undo their belt or harness to attract your attention, so make sure they’ve got something to entertain them before you set off. On longer journeys, our travel accessories keep them cool and comfortable, allowing you to concentrate on driving.

Head support cushion

Specially designed to give young babies extra comfort and support in child car seats.

Sun canopy

For use with group 0 and 0+ car seats both in and out of the car. Helps to protect your baby against strong sunlight.

Car sun blind

Suction pads secure the blind in the best position to shield your child from direct sunlight and UV rays.

Travel blanket

For use with group 0 and 0+ car seats. Helps to keep your baby warm in and out of the car during the winter months.

Extra rear-view mirror

Helps you keep an eye on your child when travelling.

Car tidy

Useful for storing books, toys, drinks and snacks.

Washing machines



Correct fitting of car seats and boosters is crucial. All the car seats in our range have clear instructions for safe fitting and use.

Manufacturers usually have fitting lists on their websites so you can check the seat you like is compatible with your make and model of car. The websites also have videos, showing you how to fit the seats.

Partners in our shops are trained to give you advice and demonstrate fitting. Find out more about our demonstration service. 

Check that your seat is safe and secure using the following guidelines. If you’re not sure about how to fit the seat, please don’t hesitate to contact the manufacturer for guidance.

Fitting tips

  • The seat should be fitted as tightly as possible – there should be no excessive forward or sideways motion

  • Ensure that the integral harness is adjusted for every journey. The harness should fit snugly, allowing one finger between the harness and your child's chest

  • The harness buckle should be as low as possible to keep the lap section across the pelvis and not across the stomach

  • If there is too much slack – usually because the anchorage points are too far forward – choose an alternative position for the seat (or even a different car seat)

  • Check that the buckles are not lying against the child seat frame, as this could affect the seat's performance in an accident

  • Keep fitting instructions in a safe place. You may need them again, particularly for combination car seats

  • The safest place for a child to travel in a car is in the centre rear, as this is likely to be furthest from any impact. However, the use of a seat belt in any position in the car, including the front seat, is far safer than a child travelling unrestrained

  • In Group 0+ and 1 seats, check that the shoulder strap of the integral harness in rear-facing seats is slightly below your child's shoulder level. In forward-facing seats, the straps should be level with or slightly above your child's shoulder. Once you reach the top slots for the straps, your child can continue to use the seat until his or her eyeline is level with the top of the seat shell


  • Use a child restraint appropriate to your child's weight and development and until your child reaches 135cm in height or their 12th birthday (whichever is sooner)
  • Read the fitting instructions carefully. If in doubt, contact the manufacturer
  • Practise using the car seat before putting your child in it for the first time
  • Ensure everyone who will be fitting the seat is confident in doing so
  • Use a child restraint appropriate to your child's weight and development and until your child reaches 135cm in height or their 12th birthday (whichever is sooner)
  • Check the seat regularly to ensure it is secure
  • Discourage your child from playing with the buckles
  • Check regularly for wear and tear on harness, buckles and seat shell
  • Check that shoulder straps are slightly below the child's shoulders in a group 0 or 0+ seat, and level with, or slightly above the shoulders for forward-facing seats. Once you reach the top slots of the straps, the child can continue to use the seat until his or her eyeline is level with the top of the seat shell
  • Use an additional rear-view mirror to keep an eye on your child, to avoid having to look around while driving


  • Use a second-hand car seat, as there could be invisible damage to the structure
  • Use a car seat that has been in an accident, however minor. There may be invisible damage
  • Use a cushion or similar support under a child instead of a booster seat, as it will not give the same level of protection in an accident
  • Leave metal fittings exposed on a sunny day - they can get very hot. Keep a blanket in the car to cover the seat when not in use
  • Leave heavy or sharp objects loose in the car, as they can cause injury in the event of an accident
  • Leave your child alone in the car, not even for a moment
  • Cover or modify buckles to prevent your child from playing with them, as this may seriously affect the quick release mechanism in an accident
  • Strap two children into one belt
  • Put an adult belt round an adult and child together

What is iSize?

The R129 regulation, more commonly known as iSize was introduced in 2013. It was brought in to offer improved protection for younger children and make travel in a vehicle even safer. In this regulation you select a car seat based on your child’s height rather than their weight.  

Current child car seat laws mean it is legal to use either an R44.04 (weight based regulation) or an R129 car seat. So iSize doesn’t replace anything, it just gives you an alternative option when picking the best seat for your baby or child. 

Good to know about R129 (iSize):  

  • A baby must travel in the safer rear-facing position up to the minimum recommended age of 15 months. Some iSize car seats can even be used rear-facing until a child is 105 cm tall, which is around 4 years old. 
  • Side impact testing is assessed as part of the regulation

Shop iSize car seats


Compared to a three-point seat belt, a harness not only spreads a crash load more evenly, it also gives you more control of your child and reduces the chances of them escaping from their seat


Isofix are fixed points within your vehicle’s seats that can be used to attach your child’s car seat. The benefit of Isofix is that it's easier for parents to be confident they have the correct fit than when they use a three-point seat belt to secure a car seat.

  • All cars produced after 2011 are equipped with Isofix points
  • i-Size car seats will fit into all i-Size cars and almost all other cars with Isofix points
  • Check whether your car has under-seat storage, as this may affect the Isofix base you can have

You can check to see if you have an Isofix system by:

  • Contacting your vehicle manufacturer

  • Consulting your vehicle manual

  • Looking for staple-shaped fittings between the back and bottom of the seat



Watch these videos from RoSPA for more help with choosing and fitting a car seat


Types of seat

Rear-facing seats

Forward facing

High backed

Booster cushions


If you need help with a product you've purchased from us, please call the Nursery department of your nearest John Lewis & Partners for assistance. 

We recognise that bringing in the product can be difficult, and in some cases the issue can be resolved without you needing to leave home.

Find out more about our car seat guarantees.

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