Cosatto Acorn 2 i-Size review: a stylish, safe and practical baby car seat for everyday family life

How we tested the Cosatto Acorn 2 i-Size car seat

• Tested with a three-month-old over a three-week period

• Used two to three times a week on everyday journeys

• Installed and removed multiple times to reflect real-life use

• Tested in a Kia Sportage

Tamsin tested the Acorn 2 with her three-month-old son over three weeks, using it regularly for everyday journeys. While her son was still small, the seat was typically used two to three times a week, giving her a clear sense of how it handled day-to-day family life.

The Acorn 2 was installed and removed several times during the testing period, which helped Tamsin understand how intuitive the fitting process felt. She found there was a short learning curve at first, particularly around making sure the seat was positioned correctly on the base, but once she was familiar with the process, using the seat became much easier.

After testing, Tamsin scored the Acorn 2 on a few key criteria including performance, quality and durability, ease of use, value for money, safety and stability, comfort, adjustability and overall usability. These scores were combined to give an overall rating of 80 out of 100 which translates to a four-star rating overall.

Cosatto Acorn 2 i-Size car seat: what’s in the box?

The Acorn 2 comes ready to use straight out of the box, so you won’t need to assemble anything before taking your baby on their first journey.  In the box, you’ll find:

• The Acorn 2 i-Size car seat

• A removable newborn nest (insert) – can be removed as your baby grows

• A set of instructions

• A 4-year guarantee card

• A vehicle list – a list of cars that the Acorn 2 has been tested in and approved for, helping parents check compatibility with their own vehicle

Everything included is designed to make setup as straightforward as possible, and the instructions are clear enough to guide first-time users through fitting the seat safely. It’s worth noting that if you’re buying the Acorn 2 car seat on its own, you’ll need to purchase the Rotating Family Car Seat Base separately. Alternatively, the base is included if you buy the seat as part of the Cosatto Wow 3 Everything bundle.

What is the difference between the Cosatto Acorn Rotating Family Car Seat Base and the Cosatto Acorn i-Size car Seat Base?

Both the Cosatto Acorn i-Size Car Seat Base and the Acorn 2 i-Size Rotating Family Base are ISOFIX bases that work with the Acorn 2 infant seat, but they serve slightly different needs and budgets. The standard Acorn i-Size base is the more affordable option, while the Rotating Family Base comes at a higher price point, reflecting its added 360-degree spin and extended usability as part of a longer-term car seat system.

Cosatto Acorn i-Size Car Seat Base:

• A straightforward ISOFIX base with a support/load leg for stability and visual indicators to confirm correct installation.

• Fully R129 (i-Size) compliant when used with the Acorn 2 car seat.

• Ideal if you just want a secure, reliable foundation for the Acorn 2 without any extra features.

Cosatto Acorn 2 i-Size Rotating Family Base:

• Adds a 360-degree rotation feature, allowing the seat to swivel towards the car door for easier lifting in and out.

• Equipped with a support leg, anti-rotation lock, visual indicators, and certified to R129/03 standards, so safety and stability are on par with the standard base.

• Suitable from birth to 15 months with the Acorn 2 and designed to pair with Cosatto’s All Stages i-Size 360 seat for longer-term use.

• Tested rigorously for side impact and rollover safety, with a reinforced shell and optional rebound bar to give extra protection in a crash.

• The base also folds for easy storage and transport, making it practical for busy families or longer journeys.

In short, the standard i-Size Car Seat Base is perfect for everyday use with the Acorn 2, giving a safe and stable setup, while the Rotating Family Base adds convenience, easier access, and the option to grow with your child.

How easy is the Cosatto Acorn 2 i-Size car seat to install?

Very! Tamsin found the Acorn 2 extremely straightforward to install, which made everyday use much less stressful. One of the first things she liked was that there’s no assembly required. The seat comes ready to go straight out of the box. Using the ISOFIX base, she was able to slot the car seat into the ISOFIX docks and secure the support/load leg in place with ease.

Even in a windy storm, Tamsin managed to install the base in under three minutes. She followed a helpful YouTube video to make sure she was doing it correctly, but the red and green colour-coded indicators on the base and seat made it almost fool-proof. The ISOFIX connectors click audibly into place, and the indicators turn green when the car seat is securely fitted, giving immediate reassurance that everything is locked safely.

It’s important to check that there’s no gap between the back of the Acorn 2 and your car’s seat, and to ensure the load leg is fully extended with the indicator showing green on the floor. Once in place, Tamsin found the process very intuitive and quick. It really takes the stress out of moving the seat between cars or getting ready for a trip.

Overall, Tamsin felt confident that the indicators and audible clicks made installation safe and straightforward, even for first-time users.

Cosatto Acorn 2 i-Size car seat: how does it look?

Tamsin was really taken with the look of the Acorn 2, especially the playful patterns that Cosatto is known for. The Acorn 2 is available in a variety of colourways and prints, from nature‑inspired designs like Meadow and Foxford Hall to more abstract or bold patterns such as Masquerade, Doodle Days, Bobtail, Silhouette and Whisper. Whether you prefer soft greens, warm neutrals or something a bit livelier, there’s a choice to suit different tastes and nursery or car interiors.

The recycled material the car seat is made from was another highlight. Tamsin says it’s great to see sustainability considered in the design. While it’s eco‑friendly (with fabric made from recycled bottles), this doesn’t compromise on quality; the plastic shell feels sturdy and secure.

In terms of weight, the Acorn 2 sits at around 13kg with the base (4.25kg for the car seat alone), which is comparable to similar infant car seats. For example, the Graco Turn2Me DLX weighs about 13.4kg, and the Joie i‑Spin 360 i‑Size is closer to 13.9kg, making the Acorn 2 a touch easier to lift and move between vehicles when you’re moving the base as well. This can be a real advantage if you’re frequently in and out of the car.

Overall, Tamsin felt the variety of print options means most parents can find something they genuinely like.

What safety features does the Cosatto Acorn 2 i-Size car seat have?  

Having received a strong ADAC rating of 1.9 when used with the Acorn i-Size Car Seat Base or the Rotating Family Base, the Acorn 2 is considered to be a safe car seat for infants up to 15 months.  

For added reassurance, the seat features a flip-out Side Impact Protection System, designed to absorb and disperse force in the event of a side collision. Combined with the reinforced shell and secure ISOFIX fitting, this gave Tamsin confidence throughout testing that her son was well-protected on every journey.

The seat itself is well padded – especially when used with the newborn nest and fitted with reinforced harness straps and a strong locking mechanism on the ISOFIX base, which remains secure even with the 360-degree rotation of the Rotating Family Base. The straps are very snug and can feel a little fiddly at first, but Tamsin felt it was reassuring to know they were firmly locked in place rather than too loose in a hurry.

For younger babies, the newborn nest adds both comfort and support, helping keep them safely positioned from birth. The Acorn 2 can also be installed rearward-facing using a standard three-point seat belt, which is useful if ISOFIX points aren’t available in the car. When paired with either approved base, the seat is i-Size (R129) compliant, meeting the latest European safety standards.

What is the Cosatto Acorn 2 i-Size car seat like to use day to day?

Overall, Tamsin feels that the Cosatto Acorn 2 i-Size fits well into everyday family life, once you’ve familiarised yourself with the setup. While the instructions are included in the booklet, she found that watching a YouTube video was the easiest way to understand the initial installation and adjustments, particularly when it came to tightening the harness correctly. The process isn’t difficult, but it does take a little getting used to at first.

In daily use, the seat fits comfortably into the back of a Kia Sportage without feeling bulky or intrusive, which is reassuring for families with similar-sized SUVs. The rotating base (when used) makes lifting a baby in and out much easier, especially in tighter parking spaces.

The one-handed harness and headrest adjustment is a real highlight. Both adjust simultaneously, meaning there’s no need to rethread the harness as your child grows. This makes quick tweaks easy when your baby hits a growth spurt or needs adjusting while out and about. For newborns, the removable newborn nest helps cocoon smaller babies, offering both comfort and a secure fit.

Adjusting the harness itself is straightforward once you know how it works: simply press and hold the adjuster button to loosen the straps, then pull the central strap to tighten. While the buckle isn’t magnetic, unlike some other car seats on the market, it still feels solid and secure once fastened. The harness can feel a little fiddly at first, particularly when positioning the straps around a wriggly baby, but this improves with regular use.

The Acorn 2 works as part of a travel system and is compatible with Cosatto pushchairs including the Cosatto Wow 3 travel system, using the correct car seat adapters. It can also be used with Cosatto’s universal car seat adapters on many other pushchairs that support Maxi-Cosi–style car seat fittings, offering flexibility beyond the Cosatto range. As compatibility can vary, it’s best to check individual pushchair guidance before buying.

How comfortable is the Cosatto Acorn 2 i-Size car seat?

The Cosatto Acorn 2 feels immediately cosy and well-padded, which is exactly what you want in a car seat designed for the first year after birth. The generous cushioning supports a newborn’s head, neck and body, helping little ones feel snug and secure from the first journey home onwards.

There aren’t any reclining positions on this seat, which may be a disappointment if you’re used to multi-recline models like the Graco Turn2Me DLX. That said, this is very much in line with its design as an infant-only i-Size seat, where maintaining the correct upright angle is important for both safety and breathing in very young babies. While it would be nice to have some adjustability, we understand why Cosatto has prioritised safety and simplicity here.

Tamsin says, “Although we didn’t have much sunshine during testing, the extendable hood fully covers our son, offering reassuring protection from bright light and potential glare. This also helps create a more enclosed, calming space, useful for naps on the go or overstimulating car journeys.”

While the Acorn 2 doesn’t offer the customisation of some longer-lasting or rotating seats, it delivers where it matters most for newborns: soft padding, good support and a cocoon-like feel that helps babies stay comfortable and settled in the car.

Is the Cosatto Acorn 2 i-Size car seat easy to clean?

Yes, the Cosatto Acorn 2 is straightforward to keep clean, which is a big plus when you’re dealing with the inevitable spills and general baby mess that come with everyday use.

The seat features easily removable, machine-washable covers, making it simple to freshen things up without too much effort. The fabrics lift off without a struggle, so you’re not wrestling with complicated fastenings when time (and patience) is in short supply. Once washed, the covers can be refitted easily, helping maintain that soft, comfortable feel for your child.

Tamsin says, “During testing, we found the materials forgiving of minor messes, and the padding underneath stayed protected, reassuring for longer-term use. As with most car seats, spot-cleaning small marks worked well for us.”

Does the Cosatto Acorn 2 i-Size car seat offer good value for money?

Yes, overall, the Cosatto Acorn 2 offers strong value for money, particularly for parents who want a safe, comfortable and well-designed infant car seat from a trusted brand.

Tamsin says, “We have been very happy with the Acorn 2 due to the safety, design and comfort that it offers our son.” While it doesn’t come with lots of extras when purchased as a standalone seat, the fundamentals - safety, comfort and ease of use, are all solid.

Price-wise, the Acorn 2 sits in line with other premium infant i-Size seats such as the Maxi-Cosi Coral 360 i-Size car seat. Both models offer a lightweight removable inner carrier and rotating base compatibility, features that make everyday tasks like lifting your baby in and out of the car far easier. Where the Acorn 2 stands out is its generous padding and distinctive Cosatto design, while often coming in at a more accessible price point than some comparable big-name options.

For parents who want to buy into a complete travel system, the value improves further. The Acorn 2 is compatible with the Cosatto Wow 3 Everything bundle, which includes a stroller, carrycot, car seat adaptors, footmuff and other essentials, a cost-effective option if you’re starting from scratch.

About the author

Tammy Jacks has over 20 years of experience in the publishing industry, holding key roles such as Managing Editor and Health & Beauty Editor for Woman & Home magazine in South Africa, and Assistant Editor for Living and Loving - a parenting title focused on children's health and development. She has also contributed to various lifestyle publications (including magazines, journals and newspapers) and edited books for fitness influencers and health professionals.

As a researcher and writer, Tammy specialises in children's development, wellbeing and safety, particularly focusing on car seats, having written extensive guides for Mumsnet on rear-facing car seats as well as car seat regulations in the UK.

Her expertise in this area is informed by both professional knowledge and personal experience as a mother. As a keen runner and cyclist Tammy has also reviewed numerous baby travel products with her daughter in tow, including strollers and pushchairs, child bike seats, all-terrain prams and the best running buggies on the market, thus offering valuable insights into safety, comfort, and convenience for families.