BABYFAYRE / A LITTLE GUIDANCE
Choosing a car seat
A practical UK guide for parents and carers. Start with your child, then check the exact seat and the car.
Four steps before you buy
1. Know your child
Record their current height, weight and date of birth. For a baby who cannot stand, use recent reliable measurements; do not try the standing-height illustration. Age alone is not enough to choose a seat. [2]
2. Read the exact seat label
Check the approval label and manual for that exact model. Write down its permitted child size range and the limits for each mode. A retailer title, group name or approximate age is only a starting point. [2]
3. Check every vehicle
Check the exact seat, any required base, your vehicle model and year, and the intended seating position. Ask a trained fitter to demonstrate the fit in each car before you buy. [4]
4. Confirm what you are buying
Check whether the offer is a seat, a base only, a seat-and-base package, or a pushchair bundle. Confirm the included parts and that you can obtain the correct instructions. [2]
Height-based seats: read the actual range
For R129 height-based seats, check your child against the approved height range on the seat and in its instructions. Also follow any stated maximum child weight and minimum-age conditions. Do not infer the range from a group number or an i-Size product name. [1]
Rear-facing: do not rush a change
UK rules require height-based seats to remain rear-facing until the child is over 15 months old. This is a legal minimum, not an instruction to turn the seat then. Keep rear-facing within the exact seat's approved rear-facing limits and follow its instructions. [1] [5]
The UK legal baseline
Children normally need a suitable child car seat until their 12th birthday or until they reach 135 cm tall, whichever happens first. Exceptions exist; check GOV.UK for the rules for your journey. [1]
What the group numbers mean
These are older R44 weight-group labels still seen in product titles. They are not a height chart, fixed age guide, or proof that a product is correctly described. For R129 seats, use the approved height range and any weight limits instead. [1] [3]
| R44 label | Child weight range |
|---|---|
| 0 | 0-10 kg |
| 0+ | 0-13 kg |
| 1 | 9-18 kg |
| 2 | 15-25 kg |
| 3 | 22-36 kg |
Why ranges overlap
A child's weight can fall within more than one group. That does not mean every seat in either group is appropriate. The exact product approval, child fit and fitting instructions still decide. [1]
Combined groups: check each mode
Labels such as 0+/1, 1/2/3 and 0+/1/2/3 describe multi-group products. They do not mean every mode, harness or facing direction is approved across the entire advertised range. Read the separate limits and changeover instructions for that exact seat. [3]
ISOFIX, bases and rotation
These describe features or fitting arrangements, not your child's size group. Check whether a base is included, which exact base is required, and whether the combination is approved for the intended position in your car. A rotating model name does not replace these checks. [4]
Your before-you-buy checklist
My child, seat and vehicle notes
Print the PDF to keep your notes. Entries made here are not saved when you leave or refresh the page.
Sources and further help
- GOV.UK: child car seats - the law
- RoSPA: choosing child car seats
- RoSPA: seat types and group labels
- RoSPA: fitting and vehicle compatibility
- RoSPA: rearward-facing baby seats
Guidance checked . Recheck official advice and the exact product manual before use. This is a choosing guide, not a seat-specific installation manual. No product is certified or individually recommended here. Illustrations are AI-generated.