We've just crash tested the first i-Size car seats from Bugaboo and Uppababy

Our latest batch of car seat reviews includes crash test results of the first i-Size child car seats from Bugaboo and Uppababy.

We've assessed them head to head to highlight their similarities and differences, so you can choose which one is the best child car seat for you.

Bugaboo Turtle vs Uppababy Mesa

Bugaboo Turtle	Uppababy Mesa
Type of car seat	Baby i-Size	Baby i-Size
Height range	40-85cm	40-78cm
Direction of travel	Rear-facing	Rear-facing
Installation mode	Isofix base	Isofix base
Seat belt installation possible	Yes	Yes
Weight of seat	4.4kg	4.9kg

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Bugaboo Turtle i-Size car seat

The Bugaboo Turtle is an i-Size car seat that's approved for use for babies measuring 40 to 85cm, which is roughly birth to 15 months.

It can also be fitted on to any Bugaboo pushchair to turn it into a travel system.

It's being made in partnership with baby brand Nuna and offers a rearward-facing seat that can be fitted on to an Isofix base (£350) or by using the vehicle's adult seat belt (£220).

We've crash tested it both ways.

Uppababy Mesa i-Size car seat

The launch of the Uppababy Mesa on to the UK market has been a long time coming - we first reported on it in October 2017.

Like the Turtle, it's a rear-facing, i-Size baby car seat approved to the latest R129 regulations.

Its height limit is slightly smaller than the Turtle, as it's approved for babies measuring 40 to 78cm, which is from birth to around 13 months.

It's also travel-system compatible and can be fitted on to Vista or Cruz pushchairs.

It can be used with an Isofix base or installed by seat belt.

Head straight to our car seat reviews to see all of those we've tested recently including models from BeSafe, Britax andJoie.

Which? car seat testing goes further

• Which? is part of a European test consortium, consisting of the International Consumer Research & Testing (ICRT) and the European Car Club.
• Our crash tests are severe, and go beyond the legal minimum standards, as our experts feel that they more accurately reflect what happens in real crashes.
• We crash test child car seats in two specially designed crash scenarios, using state-of-the-art crash-test dummies and sensors. Each car seat goes through the same tests in our labs, so you can directly compare their strengths and weaknesses.
• Our final test score also takes into account how easy a car seat is to install and whether there's a risk of a parent or guardian fitting the car seat incorrectly, and how comfortable the car seat is for your child.

Find out more about how we test baby car seats.