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Car Seat Weight Group

Car seat weight groups

Once you know which sort of child car seat you're looking for, head over to our child car seats reviews to see the best – and worst – performers in our rigorous tests.
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How do you know which type of child car seat to choose?

child car seats - seats for different weights The weight, not the age, of your child is the more important factor when changing groups
Child car seats are split into groups according to the weight of the child they're designed to protect.
These groups are defined by United Nations safety regulations and cover children from birth all the way up to 36kg (about 11.5 years for boys and 11 years for girls).
Each child car seat is tested by the manufacturer to ensure that it provides a minimum level of protection for children of the weight range covered by its group.
So, when choosing a child car seat, the first thing to remember is that your child’s weight is a more important factor than his or her age.
Moving babies and younger children up to the next group before they reach the maximum weight for their seat could lead to more severe injuries in a crash.

Child car seats: weight groups

There are five main weight groups for child car seats - use this table to work out which one you'll need to go for.
Weight categories
Seat groupWeight rangeApproximate age range
Group 00-10kg (0-22lb)From birth to about 11 months (boys) or 14 months (girls)
Group 0+0-13kg (0-29lb)From birth to about 12-15 months
Group 19-18kg (20-40lb)About 9 months to 4½ years
Group 215-25kg (33lb - 3st 13lb)About 3 years to 7 years
Group 322-36kg (3st 7lb - 5st 9lb)About 6 years to 12 years
It's also possible to buy seats that combine one or more groups, such as 0+ 1 (0-18kgs), 1-2-3 (9-36kg)  or 2-3 (15-36kg).
These can appear to be a more economical way of buying a child car seat as they will last your child for longer. Find out if we recommend combined Group 1-2-3 child car seats.

When to change your child's car seat

Generally we advise that you try to keep your child in the lower-group child car seat for as long as you can -  but make sure you don't leave it until your child is over the car seat's weight limit before changing.

Changing to forward facing

The most important change you'll make for your child is from rearward to forward facing. Forward-facing Group 1 child car seats are approved to be used from 9kg, but when you turn your baby forwards you expose them to the danger of their spinal cord snapping in a frontal impact crash - the forward momentum of their big head can overstretch their weak neck muscles and ligaments.
We recommend that you leave your baby in a rear-facing child car seat until they are least 15 months old, or the first of these events occurs:
  • They reach the weight limit of that seat (13kg for Group 0+, 18kg for Group 1)
  • The crown of their head is level with the top of the car seat.

Moving up a group

In most cases, the child will reach the weight limit of a child car seat before becoming too tall for it.
Children at the bottom weight of each weight group are more vulnerable to injuries. The recommended weights for each group overlaps, so we advise you to let your child reach the top weight for one group rather than swapping when they reach the bottom weight of the next.
Your child will have outgrown a Group 1, 2 or 3 child car seat if his or her eyes are level with the top of the seat.

Resources http://www.which.co.uk/baby-and-child/baby-transport/guides/choosing-a-child-car-seat/car-seat-weight-groups/

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