My baby is 16 months. Does the law say I must turn the seat?

No. GOV.UK says a child can use a forward-facing seat when they are over 15 months. That is permission for height-based seats, if the seat is approved that way. It is not an order to turn on that birthday.

We still have an ECE R44 group 0+ seat. Does 15 months apply?

GOV.UK’s 15-month sentence is under height-based (R129) seats. An ECE R44 seat follows the weight group on its label. Group 0+ is listed as a rear-facing seat up to 13kg.

Is i-Size the same as the 15-month rule?

i-Size is part of R129. The GOV.UK 15-month floor is written for height-based seats, which must show R129. Check the orange label rather than the marketing name on the box.

Can I put a height-based seat forward-facing at 12 months?

Not on GOV.UK’s wording. Height-based seats must be rear-facing until the child is over 15 months old.

Guides · Car seats · UK law

Is a rear-facing car seat required until 15 months under UK law?

Updated 10 September 2026 · Checked 10 September 2026 · By MayTally research desk — Checked against official UK sources

What do GOV.UK and the NHS actually set at 15 months?

Both pages attach 15 months to height-based seats. GOV.UK says height-based seats must be rear facing until your child is over 15 months old, and that your child can use a forward-facing child car seat when they are over 15 months old. The NHS choosing-a-baby-car-seat page uses the same floor: height-based seats must be rear facing until your child is 15 months old or over.

Swipe sideways for the full table

Where the 15-month figure appears
Seat type	What the official pages say about direction	What 15 months is not
Height-based (label shows R129)	Must stay rear-facing until the child is over 15 months; may use a forward-facing seat after that if the seat allows it	A date you must turn the seat
Weight-based (label shows ECE R44)	GOV.UK’s group table: groups 0 and 0+ are rear-facing; group 1 lists rear- or forward-facing within the weight range	A 15-month legal turn date — R44 uses the weight group on the label

Checked 10 September 2026 against GOV.UK “Child car seats: the rules” and NHS “Choosing a baby car seat”. Direction still has to match the seat’s own approved range.

Official records show 15 months as the R129 / height-based minimum. They do not describe it as a deadline to face forward.

Does the 15-month rule apply to an older R44 seat?

The 15-month sentence on GOV.UK sits under Height-based seats, which must show a capital E in a circle and R129. Weight-based seats are a separate heading: they show ECE R44 and use the group and weight table (group 0: 0–10kg; group 0+: 0–13kg; group 1: 9–18kg, rear- or forward-facing).

If the orange label is ECE R44, follow that group and weight range and the direction the seat is approved for. Do not import the R129 15-month floor onto an R44 label, and do not import an R44 9kg group-1 figure onto an R129 seat. The two approval systems are listed side by side on GOV.UK; they are not mixed into one birthday rule.

If my child is over 15 months, must I turn them forward?

No. GOV.UK’s second sentence is permission, not a command: a child can use a forward-facing seat when they are over 15 months. The seat must still be suitable for their height, and only an approved height-based seat may be used. If the seat in the car is approved rear-facing past 15 months, the legal floor has been met; turning is a product-limit question, not a GOV.UK “now face forward” duty.

Competitor pages often argue for staying rear-facing for years. That is a separate debate from the statute-facing line. This article stops at what GOV.UK and the NHS set as the minimum for height-based seats.

How do I check whether 15 months applies to my seat?

Find the orange approval label Look for a capital E in a circle and either R129 (height-based) or ECE R44 (weight-based).
If it is R129, apply the 15-month floor Keep the seat rear-facing until the child is over 15 months. After that, a forward-facing mode is lawful only if that seat is approved for it and the child is still inside the height range.
If it is ECE R44, use the group and weight Match the child’s weight to the group on the label. GOV.UK’s 15-month sentence is not the R44 heading.
Stay inside the seat’s printed range Height or weight limits on the label still apply after 15 months. “Over 15 months” is not a free upgrade to any forward-facing seat.

What 15 months is not

It is not a UK law that every child must face forward on their 15-month birthday. It is not a rule that every ECE R44 seat follows the same birthday. It is the height-based (R129) rear-facing minimum on GOV.UK and the NHS.

In shortIn short: R129 / height-based seats stay rear-facing until the child is over 15 months. That is a legal floor, not a turn-forward deadline. R44 seats follow the weight group on the orange label.

Questions parents ask

My baby is 16 months. Does the law say I must turn the seat?: No. GOV.UK says a child can use a forward-facing seat when they are over 15 months. That is permission for height-based seats, if the seat is approved that way. It is not an order to turn on that birthday.
We still have an ECE R44 group 0+ seat. Does 15 months apply?: GOV.UK’s 15-month sentence is under height-based (R129) seats. An ECE R44 seat follows the weight group on its label. Group 0+ is listed as a rear-facing seat up to 13kg.
Is i-Size the same as the 15-month rule?: i-Size is part of R129. The GOV.UK 15-month floor is written for height-based seats, which must show R129. Check the orange label rather than the marketing name on the box.
Can I put a height-based seat forward-facing at 12 months?: Not on GOV.UK’s wording. Height-based seats must be rear-facing until the child is over 15 months old.

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? — Child car seat laws in the UK — 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.