Choosing a rear-facing car seat in the UK means choosing between four types: infant carriers (including lie-flat seats), extended rear-facing seats, swivel seats and multi-stage Group 1 seats. The right one depends on your child's age, your car and your budget, and this guide gives you what you need to decide with confidence. Once you know which type suits you, browse our rear-facing car seats collection to compare infant carriers, swivel seats and extended models side by side.
In a frontal crash, a rear-facing seat spreads force across your child's back, head and neck together (read our blog dedicated to rear-facing car seats physics & why extended is safer). That is why RoSPA, the Royal Society for the Prevention of Accidents, recommends keeping children rear-facing for as long as possible.
Here we set out what each type does, who it suits and what it costs, in plain English. At DMB Car Seats, our specialists help UK parents choose, fit and compare trusted rear-facing seats from brands like Britax Römer, Axkid and Nachfolger. For the law and wider safety advice, read our guide to rear-facing car seats UK law.
The Four Types at a Glance
Every rear-facing seat sold in the UK must carry one of two approval labels: UN R44/04, which sorts seats by weight, or R129 (i-Size), which sorts them by height. The table below sets the four types side by side before we cover each in turn. The types overlap, so a swivel seat may also be an extended seat. Decide which feature matters most to you, and choose that.
| Type | Label | Typical age (varies by model) | Best for | Example from our range |
|---|---|---|---|---|
| Infant carrier or lie-flat seat | R44 Group 0/0+ or i-Size | Birth to about 12–15 months | Newborns, premature babies, short trips | Britax Römer Baby-Safe Core £139; Baby-Safe PRO £249 |
| Extended rear-facing seat | Mostly i-Size; some Plus-Tested | Newborn or 6 months to around 4 years | Keeping children rear-facing for longer | Axkid Minikid 4 Pro m £395; ONE 3 £650 |
| Swivel rear-facing seat | Mostly i-Size | Newborn or baby onwards | Easier loading, sore backs, tight parking | Axkid Spinkid 2 £299; Britax Swivel Grow Max Air £399 |
| Multi-stage or Group 1 seat | R44 Group 1 or i-Size | About 9 months to 4 years in total, rear-facing for the first part only | Spreading cost over several years | Britax Römer Dualfix 5Z £259 (needs a compatible ISOFIX base) |
Infant Carriers and Lie-Flat Seats
Infant carriers are the most common first rear-facing seat. Older R44 Group 0/0+ carriers are weight-based. i-Size (R129) carriers go by your baby's height and always face rearward. A lie-flat seat lets your baby lie on their back instead of sitting semi-reclined. Many NHS maternity services and car seat manufacturers advise no more than two hours at a time in a semi-reclined seat, so build in a break at least every two hours, or choose a lie-flat seat for longer trips.
Some premature or low-birthweight babies cannot tolerate a semi-reclined position and need a lie-flat seat. If your baby arrived early or small, settle this before discharge: ask your neonatal team about an infant car seat challenge, which monitors your baby's oxygen levels and heart rate while they sit in the seat. For the legal details, read GOV.UK child car seat rules.
Extended Rear-Facing Seats
Extended rear-facing seats keep children facing rearward until about age four, and some models go further. The Britax Römer Max-Safe Pro 2, for example, keeps children rear-facing up to 7 years (125cm). Treat age as a guide only. Limits are largely height-led, so your child's standing height decides when they outgrow the seat. Our guide to rear-facing age limits in the UK sets out the height and weight limits at each stage. Some models are also Plus-Tested, a voluntary Swedish neck-force test explained in the quick answers below. Browse them in our Swedish Plus Tested car seats collection.
Swivel Rear-Facing Seats
A swivel seat rotates towards the door, so you can buckle your child in without twisting or leaning into the car. That makes loading far easier for parents with back problems, tight parking spaces or wriggly toddlers. The rotation is for loading only. Before you drive, turn the seat back, lock it rear-facing and check that the lock indicator confirms it. Swivel car seats usually need a specific base and support-leg set-up, so check the vehicle compatibility list before you buy.
Multi-Stage and Group 1 Seats
Group 1 seats cover roughly 9 months to 4 years (9–18kg) in one purchase, but only part of that time is rear-facing. Multi-stage seats convert to forward-facing as your child grows. Some R44 models permit the switch from about 9kg, whereas i-Size seats require rear-facing until at least 15 months. A permitted switch is not a recommendation. Check the limit in the manual and keep your child rear-facing until they reach the seat's rear-facing limit.
How Rear-Facing Seats Install and Fit Your Car
A rear-facing seat protects your child only if it is installed correctly and fits your car. This section covers installation methods first, then a fit check.
ISOFIX, Support Leg or Seatbelt: Which Installation Type?
ISOFIX seats click onto two anchor points built into the car. This cuts fitting errors, which is why ISOFIX models are popular with first-time parents. Most ISOFIX rear-facing seats also use a support leg that braces against the car floor and limits rotation in a crash. Seatbelt-installed seats use the car's own belt, which suits older cars without ISOFIX points, taxis and hire cars. Follow the manual's belt routing exactly. Both methods are safe when installed correctly. If a seat moves more than 2.5cm side to side or front to back (measured at the belt path on belt-fitted seats, or at the base on ISOFIX seats), get a professional check.
Will It Fit Your Car? A Four-Point Check
Check four things before you buy. First, find your exact make, model and year on the manufacturer's vehicle list. Second, fit the seat behind the front seat and confirm the person sitting in front still has comfortable legroom. Third, make sure the support leg reaches solid floor, because underfloor storage compartments can leave it unsupported. Fourth, decide whether you need the middle seat, as many cars lack ISOFIX points there. Checks two and three need the seat in your car, so book a fit check and we will test legroom, support leg and seating position before you buy. Not sure your car is compatible? Speak to our DMB car seat specialists for friendly, expert advice on fitting rear-facing seats safely and correctly.
Choosing the Right Type for Your Child and Budget
Three decisions narrow the choice: carrier or extended, cost over time, and where you will use the seat.
Do You Need an Infant Carrier, or Can You Go Straight to Extended?
An infant carrier lifts out of the car with a sleeping baby and clicks onto many pushchairs. Most babies outgrow it by about 12 to 15 months. Many extended seats accept newborns with an insert, so one seat can last from birth to around four years. The trade-off is that the seat stays in the car and is heavier to move. The two-hour limit applies to newborns in an extended seat too. If you often carry a sleeping baby between car and pushchair, choose a carrier. If the seat will mostly stay in one car and you want the longest rear-facing use, go straight to the extended rear-facing car seat.
Cost Over Time: Buy Once or Buy Twice?
Buying an infant carrier and then a larger seat means buying twice, though the carrier costs less up front. For example, a £139 carrier plus a £395 second seat totals £534, so compare that with a from-birth extended seat. A single extended or multi-stage seat costs more up front but can last up to around four years, which often gives better value, especially if it also suits a second child. To compare, add any extra base or newborn insert to each seat's price, then divide by the years you expect to use it. Avoid second-hand seats with an unknown history, because crash damage is not always visible. Before buying second-hand, read our complete rear-facing car seat guide UK for expiry dates, recalls, crash-damage checks and safe buying advice.
Travel, Second-Car and Grandparent Options
For travel, choose a lighter seat (under 5kg, such as the Nachfolger HyFive WORLD at 4.9kg, which is rear-facing from around 6 months) that is installed with a seatbelt, so you can fit it confidently in taxis and hire cars. See our travel seats and strollers range. Check your airline's baggage policy for car seats before you fly. If you use an infant carrier in a second car, add an extra ISOFIX base so switching is quick. For grandparents, simplicity matters most: choose a seat with a lock indicator that changes colour when the seat is secure. Keep the manual in the glovebox and arrange a fit check so they feel confident.
Rear-Facing Seat Types: Quick Answers
Are Swivel Seats as Safe as Fixed Rear-Facing Seats?
Yes, when used correctly. A swivel seat approved to R129 (i-Size) has passed the same legal crash tests as a fixed seat, but only if it is locked rear-facing and correctly installed. Some parents still prefer fixed seats because there is no lock to check before each journey.
What Does “Plus-Tested” Mean, and Do You Need It?
Plus-Tested means a rear-facing seat has passed the Swedish Plus Test, a voluntary assessment that measures neck forces on a child dummy in a crash. UK law does not require it. Treat it as a tie-breaker between two seats you are already considering, especially if your child will use the seat for several years, because the test goes beyond the legal approval requirements with a particular focus on protecting your child's neck in a frontal collision.
Can a Rear-Facing Seat Go in the Front or Middle Seat?
Sometimes. In the front passenger seat, switch the front airbag off before fitting the seat, though the back seat is safer. A middle seat works only if the seat manufacturer's vehicle list approves that position. Check both the car and seat manuals, or book a fit check.
Frequently Asked Questions
1. What are the four types of car seats?
The four car seat types are rear-facing infant carriers, extended rear-facing or convertible toddler seats, forward-facing harness seats, and high-back booster seats for older children. Choose by your child's height, weight and age, and check the seat is approved to R44/04 or R129 (i-Size).
2. Is ISOFIX better than seatbelt?
ISOFIX is not automatically safer, but it reduces fitting mistakes because the seat clicks onto the car's anchor points with visual indicators. A correctly fitted seatbelt installation can be equally safe. Choose ISOFIX if your car supports it, and book a fit check.
3. How long can a baby stay in a Group 0 car seat?
Group 0 seats suit babies up to 10kg, roughly six to nine months, while Group 0+ extends to 13kg, around 12 to 15 months. Move up when your baby hits the weight limit or their head reaches the shell top, whichever comes first.
4. What is a high-back booster seat?
A high-back booster seat raises your child so the adult seatbelt sits correctly across the collarbone and hips, while its backrest and headrest add side-impact protection. It suits children who have outgrown a harness seat, typically from around four years old (100cm for i-Size).
5. What is Uber's child seat policy in the UK?
Uber UK says child seats are uncommon, so bring your own. Children under 15 months must use a rear-facing baby seat. Without a seat, children may travel only in the back, belted from age three, and drivers may refuse unsafe rides.
6. When to change to a booster seat?
Move to a booster only when your child outgrows their harness seat's height or weight limits, not by age alone. i-Size boosters start at 100cm, and R44 boosters from 15kg. The law requires a child seat until 12 years or 135cm, whichever comes first.
Which Type Is Right for You?
Choosing a rear-facing car seat comes down to four things: your child's age and height, your car, safety and budget. Whether you pick an infant carrier, an extended, swivel or multi-stage seat, keep your child rear-facing for as long as the seat allows, and make sure it is installed correctly. Every type has its place, and our rear-facing car seat collection is a good place to compare them. Tell us in the comments: which type are you leaning towards, and what is the biggest question still holding you back?
DMB Car Seats
Phone: +44 7388 837714
Location: DMB Car Seats, Unit 2A Wardes Road, Inverurie, Scotland, AB51 3TT, UK