Car Seat Buying Guide

Car Seat Buying Guide

Confused? We are here to help!

Welcoming a new arrival into the world is an exciting time for every family. You want to make sure your child is as safe as possible when travelling by car, so it's vital to find a car seat that's suitable for their height and weight and fitted correctly in your vehicle.

As a parent you want to make sure your children get the best protection there is, so we've created a handy car seat guide to make finding the right seat a little easier and to clarify terms such as i-Size, Isofix and ERF. After all, your child's car seat will protect them in the event of the unexpected, making it one of the most important and worthwhile investments you'll make.


  • Choose a car seat based on your child’s height and weight and one that is compatible with your car
  • Weight-based car seats must be rear-facing until your child weighs more than 9kg
  • Height-based car seats are known as ‘i-Size’ seats and must be rear-facing until your child is over 15 months old
  • Children must use a car seat from birth until they’re 12 years old or 135cm tall (whichever comes first)
  • Never use an infant carrier on the front passenger seat with the airbag activated
  • Only EU-approved child car seats can be used in the UK
  • Ensure you have an infant carrier for baby’s first car ride home from the hospital
Britax Max-Safe Pro Car Seat


Car Seat Group Baby's Weight Baby's Age (Approx.) Car Seat Type
Group 0 0 -10kg Birth - 6 Months Rear-facing infant carrier
Group 0+ 0 -13kg Birth - 12/15 Months Rear-facing infant carrier
Group 0+/1 0 -18kg Birth - 4 Years Combination and rear-facing only
Group 1 9 -18kg 9 months - 4 years Combination and rear facing only
Group 1/2 9 -25kg 9 months - 6 years Forward-facing car seat
Group 1/2/3 9 - 36kg 9 months - 11 years High back booster with harness
Group 2/3 15-36kg 4 years - 11 years High back booster and booster cushions


i-Size is the new European standard for child car seats. It was introduced in 2013 to ensure all child car seats fit in all cars, therefore reducing the risk of installing the wrong seat in your car and compromising its effectiveness. i-Size is considered safer because infants up to 15 months old must travel in rear facing car seats.

Rear-facing car seats offer superior protection for your child in the event of a frontal collision, which is the most common type of accident on the road. We believe children should be rearward-facing for as long as possible.

i-Size is considered safer because:

  • Children have improved head and neck protection due to the more rigorous side impact testing i-Size car seats are subject to
  • You have to use ISOFIX, a system that makes the car seat easy to fit correctly in the car. i-Size car seats will fit almost all ISOFIX cars
  • Length/height of child classification (instead of weight) makes choosing the right car seat easier


ISOFIX is a standard European fitting system that refers to the two metal bars that are welded directly onto your car’s chassis. In some cars they are highly visible and in others they are concealed. The majority of infant carriers tend to fit in with a seat belt as well as ISOFIX, where as some car seats aren’t ISOFIX compatible at all. In short, if your car seat has the option to fit in with a seat belt then you don’t need an ISOFIX base.

An ISOFIX base is an attachment that’s fitted directly to the ISOFIX mountings in your car. This allows you to safely install your child’s car seat by simply clicking the car seat onto the base and lifting it off with either a lever or a button. It’s easier and it’s safer. Installing your seat using a base eliminates the chance of fitting the seat incorrectly. A survey carried out by Good Egg in 2014 found that 71% of seatbelt-installed seats tested in England were fitted incorrectly.

It’s widely believed that incorrect car seat fitting is responsible for increased child road fatalities. If you have ISOFIX in your car we would recommend that you buy an ISOFIX fitting car seat where possible.


Did you know that frontal collisions are the most common car accidents and often the most severe? We believe the best way to protect your younger passengers from forceful frontal impacts is to keep them rear-facing in their car seat for as long as possible. It has been proven that travelling in a rear-facing car seat will greatly reduce the stress on your child's neck and spine, providing superior protection in the event of a frontal impact. Your baby's muscles are still developing during the early years; if the muscles and spine are subject to too great a force the consequences may be catastrophic.

The most essential difference between you and your baby is the size of the head. For a 5-month-old baby, the head represents 25% of their total body weight. For an adult the head represents only 6%. In a forward-facing seat during an impact, the child is flung forward in their seat with their head thrown towards their knees, placing considerable strain on their delicate neck, spine and upper body. In a rear-facing car seat during a frontal impact, the child is pushed back, impact is spread across the back of the seat, with considerably less flying debris coming into contact with the child.

Pramworld Car Seat Buying Guide Head Size Chart


Swedish plus test is the most stringent test for any car seat and the only test that measures the weight load on a child’s neck. The test is not carried out in any other country, making it truly unique and an additional test to the standard.

Swedish Plus Tested Car Seat

The plus test is carried out by the Swedish VTI, an independant organisation who have no connection with any manufacturing of car seats or selling them. Because it is an extra test, child car seat manufacturers have to register for the test themselves, as it is not covered in the standard E approval (European Safety standard).

View our Swedish Plus Tested Approved Car Seats

Winstanleys Pramworld are a car seat specialist covering the North West. We are committed to safety and champion extended rear facing car seats. Our team of IOSH certified car seat experts do not have sales targets and will provide you with impartial advice and support to help you choose and install the right seat for you and your growing family. To give you complete peace of mind we'd recommend booking an in-store appointment with one of our car seat safety experts who'll not only help you select the right car seat for your needs but install it correctly in your vehicle. You can book an appointment with a car seat specialist by using the enquiry form. Alternatively you can send us an email or contact us by telephone on 01942 214864.