By clicking a retailer link you consent to third-party cookies that track your onward journey. This enables W? to receive an affiliate commission if you make a purchase, which supports our mission to be the UK's consumer champion.

Britax RömerSwingfix M Plus

i-Size baby to toddler
Isofix installation only
Extended rear-facing seat

£220View retailers

Test score

Lowest available prices

Sign up to unlock the full expert review

The Britax Römer Swingfix M Plus is a ‘convenient, no-frills car seat’ that the manufacturer says will offer the safest rearward-facing position for children up to four years old. A car seat doesn’t need fancy features to excel in our lab tests, but it does need to offer the best crash protection and hold your child securely in their seat. Find out how this model shaped up by reading our full review.

pros

Content has been blurred out, please log in to view.

cons

What's included?

What is it?
How safe is it?
Is it easy to fit?
Is the seat comfortable?
Is there anything else I should know?
Should I buy it?
Where can I buy it?

KEY TEST RESULTS
Safety rating
Fitting in car
Comfort of your child

Jan 2025Last checked by Which?
Oct 2023First reviewed by Which?
Aug 2023Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

How we test baby and child car seats

22 May 2025

Safety rating

How we test safety rating

The overall safety score is made up of the results of crash testing (front crash; side crash) seat design, stability in the car and belt routing. Our crash tests go beyond the legal minimum requirements for UK car seat regulations and are conducted at higher speeds and forces than the regulations require. We feel our tests more accurately reflect what could happen in a real life crash.

Fitting in car

Overall
Buckling up
Avoiding misuse and instructions
Cleaning
Space required in car

How we test fitting in car

Fitting and using includes: How easy it is to install the seat correctly in the car. How easy it is to strap a child securely into the seat. How well the seat is designed in order to prevent incorrect use. How easy the seat cover is to remove and wash. How little space the seat takes up in the car and how comfortable your child is in the seat.

Ergonomics

Overall
Comfort of your child

How we test ergonomics

Our experts conduct an ergonomic assessment of each seat to make sure your child will be in the best position when travelling, along with the level of padding and support. Our tests also reveal how much space this car seat takes up in the back seat of a car and how easy it is to get your child in and out of the seat. Plus, our eagle-eyed car seat experts will check whether this seat affects how much space any front passengers have. This assessment was introduced to our site in May 2015. If a seat does not have this score, it was tested before May 2015.

General
Height of child	61cm-105cm
Seat size	i-Size baby to toddler
Age group	Baby to toddler
Direction of travel	Rearward facing/forward facing
Extended rear-facing seat	Yes
Installation type	Isofix installation only
Harness or shield seat	Harness
How is the child held in the seat?	5 point harness
Manufacturer URL	https://www.britax-romer.co.uk/

Features
Adult seat belt	No
Isofix integrated into seat	Yes
Isofix base	No
Belted base	No
Type of Isofix	Isofix connectors and support leg
Swivel seat	Yes
Weight of seat (kg)	12.2kg
Part of a travel system?	No
Harness height adjustment	Moves with headrest
Adjustable headrest	Yes

Compare retailers

Prices updated daily

Prices are ordered from lowest to highest, irrespective of retailer rating or stock, and exclude any potential delivery costs. We are not able to show every possible retailer and cheaper prices may be available.

Suggested Alternatives

Britax Römer

Dualfix M Plus

i-Size baby to toddler
Isofix installation only
Extended rear-facing seat

£179View retailers

Test score

Britax Römer

Dualfix Plus

i-Size baby to toddler
Isofix installation only
Extended rear-facing seat

£240View retailers

Test score

Joie

i-Level

i-Size baby
Isofix installation only

£150View retailers

Test score

Best baby or child car seats 2025
We reveal the best car seats for newborns, toddlers and children, based on our tough lab tests, plus expert buying advice on types and jargon
How we test baby and child car seats
We crash-test every baby, toddler and child car seat we review to reveal which ones give the best protection, and which you should avoid
Car seat weight groups and height groups explained
We explain how to choose a car seat that fits your child, whether it's a newer i-Size car seat or an older group 0, 1, 2 or 3 car seat

All child car seat advice

Suggested searches

Britax RömerSwingfix M Plus

Lowest available prices

Sign up to unlock the full expert review

pros

cons

What's included?

How we test baby and child car seats

Safety rating

Fitting in car

Ergonomics

Compare retailers

Suggested Alternatives

Britax Römer

Britax Römer

Joie

Related articles

Britax RömerSwingfix M Plus

Lowest available prices

pros

cons

What's included?

Test results

Specifications

Where to buy (2 retailers)

Suggested Alternatives

Britax Römer

Britax Römer

Joie

Related articles