Guides · Car seats · Rear-facing minima
Is R129 rear-facing until 15 months versus R44 9 kg?
What does GOV.UK say about turning an R129 seat?
GOV.UK puts the height-based rule in two sentences: height-based seats must be rear facing until your child is over 15 months old. “Your child can use a forward-facing child car seat when they’re over 15 months old.” Those seats are the ones whose orange label shows a capital E in a circle and R129.
The NHS choosing a baby car seat page repeats the same 15-month line for height-based seats. Milton Keynes University Hospital’s leaflet adds 76 cm beside “under 15 months” for UN R129. Those are minima for this approval family — the earliest the regulation allows a forward-facing R129 use — not a target date you must hit.
GOV.UK’s words are “over 15 months” and “can use”, not “must turn”. The seat’s own height range and any max weight still apply. A 14-month-old over the centimetre limit is a different problem from the facing rule.
What does the R44 “rearward-facing to 9 kg” line mean?
Which? (July 2026) contrasts the two regulations in a table: R44/04 — “Baby must be rearward-facing until 9 kg (approx 10 months)”; R129 — “Baby must stay rearward-facing until 15 months.” That 9 kg figure is the R44 Group 1 start, not a GOV.UK sentence that every R44 baby turns at 9 kg.
Swipe sideways for the full table
| Approval on the orange label | Facing minimum in the sources | What GOV.UK’s weight table allows after that | What this seat may still require |
|---|---|---|---|
| R129 (height-based) | Rear-facing until the child is over 15 months (GOV.UK) | Forward-facing child seat once over 15 months | Stay inside this seat’s cm range and max kg; some shells stay rear-facing to 105 cm |
| R44 Group 0 / 0+ | GOV.UK: these groups are rear-facing carriers / seats | Not a forward-facing group | 0–10 kg (Group 0) or 0–13 kg (Group 0+) |
| R44 Group 1 (9–18 kg) | Which?: R44 rearward-facing until 9 kg; GOV.UK Group 1 may be rear- or forward-facing | A Group 1 seat using a harness or shield | This model’s manual — some R44 combination seats stay rear-facing to 18 kg |
| Any seat, babies | Lullaby Trust: babies travel in rearward-facing baby seats | Not an R44-versus-R129 ranking | Take the baby out to a firm, flat sleep space when you arrive |
Are 15 months and 9 kg the same rule in different units?
No. They belong to different approvals. You do not convert 15 months into 9 kg, or 9 kg into 15 months, and apply the answer to every seat in the house. The child in an R129 seat is on the GOV.UK 15-month clock (and that seat’s cm / kg limits). The child in an R44 Group 0+ is on the 13 kg rear-facing band. The child moving into R44 Group 1 is at the 9 kg door Which? listed.
RoSPA’s types of seat page: i-Size seats “are designed to keep children rearward-facing until they are at least 15 months old”, and a Group 0+ / 1 combination “start[s] off rearward-facing until the baby is at least 9 kg and [is] then turned forward-facing — some stay rearward facing until the child has reached 18 kg.” Two minima, two manuals.
Does the Lullaby Trust pick R129 over R44 for facing?
No. The Lullaby Trust car-seat factsheet (February 2025) says it is essential that babies travel in rearward-facing baby seats, because those seats protect the head, neck and spine compared with forward-facing seats. It then says seats must conform to ECE R44.04 (or R44.03) or R129. That is a baby-facing statement plus an approval list — not a ranking of R44 against R129.
The same factsheet is about sleep: a car seat is for transport, not a cot. Take the baby out onto a firm, flat surface when you arrive. That advice does not change if the orange label says R44 or R129.
When is this seat actually allowed to turn?
Read the approval family, then this manual. An R129 seat: GOV.UK’s earliest forward-facing point is over 15 months, and only if that seat’s height range and facing modes allow it. An R44 Group 0+ does not become a forward-facing seat at 9 kg; 9 kg is the Group 1 threshold. A convertible R44 that lists rear- and forward-facing Group 1 still has to match 9–18 kg and the maker’s facing instructions.
Which? notes many R129 seats are built to stay rearward-facing towards four years / 105 cm. That is the seat’s own range, above the 15-month minimum. Bent knees are not, on Which?’s page, a sign the seat must turn.
In shortIn short: R129’s facing minimum is over 15 months (GOV.UK). R44’s often-quoted facing minimum is 9 kg (Which? / Group 1). They are approval floors, not a conversion and not a ranking. The Lullaby Trust wants babies rearward-facing; it does not score R44 against R129. Stay inside that seat’s own limits.
Questions parents ask
- Can I turn an R129 seat forward on the day my baby turns 15 months?
- GOV.UK says the child can use a forward-facing seat when they are over 15 months. That is permission at the regulation minimum, not an instruction to turn that day. The seat must also offer a forward-facing mode and still match the child’s height (and any max weight). Many R129 seats stay rear-facing well after 15 months.
- My R44 combination seat says I can turn at 9 kg. My baby is 8 months. Does GOV.UK’s 15-month rule apply?
- GOV.UK’s 15-month sentence is in the height-based (R129) section. Which? quotes 9 kg as the R44 rearward-facing minimum. Follow the approval on this orange label and this manual. Do not import the 15-month R129 floor onto an R44 Group 1 label, or the 9 kg figure onto an R129 label.
- Is 9 kg the same as 15 months?
- No. Which? approximates 9 kg as about 10 months. GOV.UK’s R129 line is 15 months. They are different numbers on different approvals. Children reach 9 kg at different ages; that is why R44 uses weight and R129 uses a month floor plus height.
- Does rearward-facing longer mean R129 is the only approved option?
- No. GOV.UK still lists both R129 and ECE R44. The Lullaby Trust lists R44.03 / R44.04 or R129 and asks for rearward-facing for babies. A longer rear-facing range on an R129 box is that product’s design, not a withdrawal of R44 from the use list.
Sources
Official pages first. If this page and the official page disagree, the official page wins.
- GOV.UK — Child car seats: the rules — checked 10 September 2026
- NHS — Choosing a baby car seat — checked 10 September 2026
- Which? — Car seat weight groups and height groups explained — checked 10 September 2026
- The Lullaby Trust — Car seat factsheet (February 2025) — checked 10 September 2026
- RoSPA Child Car Seats — Types of seat — checked 10 September 2026
- Milton Keynes University Hospital NHS — Car seat information — checked 10 September 2026
This is information, not a guarantee of any payment, and not medical, legal or product-safety advice for your home. Prices and rules change; figures carry the date they were checked. Recall status comes from official records only — a product we cannot find is not a safety all-clear. Tell us if we got a fact wrong.