For a family whose pushchair came with an infant car seat, the question in the car is which child car seat rules apply. This guide reads two official pages on 3 November 2026: the GOV.UK page “Child car seats: the law” (the GOV.UK content record shows a public update of 1 April 2015) and rules 99 to 102 of the Highway Code (public update 14 September 2021, on GOV.UK). Neither page mentions pushchairs, prams or travel systems, so they are read here as general rules on child car seats. General information, not legal advice.
Which seat counts: the labels
GOV.UK says children must normally use a child car seat until they are 12 years old or 135 centimetres tall, whichever comes first, and that the seat can be chosen by height or by weight.
- Height-based seats must be rear facing until the child is over 15 months old, and approved seats carry a capital E in a circle and “R129”.
- Weight-based seats carry a capital E in a circle and “ECE R44”. For 0 kg to 10 kg (group 0) the page lists a lie-flat or lateral baby carrier, a rear-facing baby carrier or a rear-facing baby seat using a harness. For 0 kg to 13 kg (group 0+) it lists a rear-facing baby carrier or rear-facing baby seat using a harness.
GOV.UK says only approved seats of each type can be used in the UK. The Highway Code, in rule 100, says a child under 1.35 metres tall must use a baby seat, child seat, booster seat or booster cushion suitable for the child’s weight and fitted to the manufacturer’s instructions.
Fitting: belts, ISOFIX and side-facing seats
GOV.UK says a child car seat must only be used if the car’s seat belt has a diagonal strap, unless the seat is designed for use with a lap belt or is fitted using ISOFIX anchor points. It also says a child car seat must not be fitted in side-facing seats.
The front seat and the airbag, worded two ways
- GOV.UK: deactivate any front airbags before fitting a rear-facing baby seat in a front seat.
- Highway Code, rule 101: a rear-facing baby seat must not be fitted into a seat protected by an active frontal airbag.
The two pages word the point differently, and neither says anything about a particular car or seat.
Taxis and private hire vehicles
GOV.UK says that if a taxi or minicab driver does not provide the correct child car seat, children can travel without one, but only on a rear seat, wearing an adult seat belt if aged 3 or older and without a seat belt if under 3. The Highway Code table for a child under 3 says the correct restraint must be used and that, if one is not available in a taxi, the child may travel unrestrained. For a child from the 3rd birthday up to 1.35 metres, it says an adult belt must be used if the correct restraint is not available in a licensed taxi or private hire vehicle.
Minibuses, coaches and vans
GOV.UK says minibus or coach drivers and companies do not have to provide child car seats and that a family must bring its own to be sure a child has one. On coaches, children can travel without a car seat or seat belt if none is available. In minibuses, all children must travel in rear seats, meaning any seats behind the driver, if a car seat or adult belt is not fitted. The rules for vans are the same as for cars.
Unexpected journeys and a crowded back seat
GOV.UK says a child aged 3 or older can use an adult belt when the correct seat is not available if the journey is unexpected, necessary and over a short distance. A child under 3 cannot be taken on such a journey without the correct seat unless it is a licensed taxi or minicab and the child sits on a rear seat without a belt. If there is no room for a third child car seat in the back, the page says a child under 3 must travel in the front seat with the correct child car seat, while a child aged 3 or older can sit in the back using an adult belt. The Highway Code table gives similar exceptions in its own words, including a case where two occupied restraints prevent fitting a third.
What the two pages do not settle
- Whether a given infant seat fits a given pushchair frame, or which adapters are needed. Neither page mentions pushchairs.
- Which car seat suits a given car, a point on which GOV.UK refers readers to the Child Car Seats website.
- Whether a seat is still suitable once it is old or has been used before. Neither page covers this.
The Highway Code says the restraint must be fitted to the manufacturer’s instructions.
The bottom line
GOV.UK says children must normally use a child car seat until they are 12 years old or 135 centimetres tall, whichever comes first, and the Highway Code says a child under 1.35 metres must use a restraint suited to the child’s weight, fitted to the manufacturer’s instructions. Both pages mention the rear-facing seat and the active frontal airbag, with different wording. The taxi, minibus and unexpected-journey exceptions are described in more detail on GOV.UK than in the Highway Code table. Neither page mentions pushchairs or travel systems, so the pushchair side of a travel system is outside what they cover.
Sources
- Child car seats: the law, GOV.UK, public update 1 April 2015 per the GOV.UK content record, read 3 November 2026 (gov.uk)
- The Highway Code: rules for drivers and motorcyclists (89 to 102), GOV.UK, public update 14 September 2021, read 3 November 2026 (gov.uk)