Child Seat Sizes

Child restraints are grouped into a number of categories, each one suitable for a particular weight range or a broad age group. These categories often known as Stages, and the majority of restraints will fit into 2 or more stages, allowing them to be changed and converted to fit the child as it grows.

The major stages of child restraint is as follows

Stage 1

  • Group 0 Rearward Facing Baby Seats
    For babies up to 10 kgs (22 lbs), and aged approximately from birth to 6-9 months.
  • Group 0+ Rearward Facing Baby Seats
    For babies up to 13kg (29lbs), and aged approximately from birth to 12-15 months.

These seats may be used in the front or rear of the car, although fitting them in the rear is a safer option. It is illegal to fit a rearward facing child restraint in the front passenger seat if there is an active passenger airbag.

It is worth noting that Group 0 baby seats are no longer produced, and the smallest type of child seat is now suitable for all babies up to a weight of 13kg (about 15 months old). It is worth keeping your baby in a rearward-facing seat for as long as possible, as it will provide greater protection for the baby's head, neck and spine than a forward-facing seat. It is recommended that you only move them to a forward-facing seat if the top of their head is higher than the top of the seat, or they have exceeded the maximum weight for that seat.

Stage 2

  • Group 1 Forward Facing Child Seat
    For children weighing up to 9-18 kgs (20-40 lbs), and aged approximately from 9 months to 4 years.

These seats may be used in the front or rear of the car, although fitting them in the rear is a safer option. Never fit in the front passenger seat if there is an active passenger airbag. Your child should remain in a child seat for as long as possible; only move them to the next stage up when the top of their head is higher than the top of the seat or when they have exceeded the maximum weight.

Stage 3

  • Group 2 Booster Seat
    For children weighing up to 15-25 kgs (33-55 lbs), and aged approximately from 4 to 6 years.

These seats may be used in the front or rear of the car, although fitting them in the rear is a safer option, particularly if there is an active passenger airbag.

It is worth noting that booster seats that only fit into Stage 3 are no longer produced; products now fit into either Stage 3 and 4 (15-36 kg) or Stages 2 to 4 (9-36 kg).

Stage 4

  • Group 3 Booster Cushion
    For children weighing up to 22-36 kgs (48-79 lbs), and aged approximately from 6 to 11 years.

These seats may be used in the front or rear of the car, although fitting them in the rear is a safer option, particularly if there is an active passenger airbag. It is worth noting that booster seats that only fit into Stage 4 are no longer produced; products now fit into either Stage 3 and 4 (15-36 kg) or Stages 2 to 4 (9-36 kg). Booster cushions are converted from booster seats by simply detaching the back rest.

Summary of Seat Sizes

The following table shows a summary of the types of child seat suitable for a range of different weights and ages. However, do bear in mind that weight is the most important factor when choosing a child seat, and ages given are intended merely as a guide.

Group Seat Type Weight
Range
Approximate
Age Range
Group 0 Rear-facing baby seat 0-10 kg

Boys:
From birth to 11 months

Girls:
From birth to 14 months

Group 0+ Rear-facing baby seat 0-13 kg From birth to 15 months
Group 1 Forward-facing child seat 9-18 kg From 9 months to 4 years
Group 2 Booster seat 15-25 kg From 4 years to 6 years
Group 3 Booster cushion 22-36 kg From 6 years to 11 years