Quick answer
Choose the Doona+ if you want a car seat that transforms into a stroller for seamless travel. Pick the Cybex Aton B2 i-Size if you prefer a lightweight, i-Size compliant seat with a removable newborn inlay.
Safety standards and newborn fit
Both seats meet strict safety regulations, but they approach newborn fit differently. The Cybex Aton B2 i-Size complies with the latest i-Size standards and includes a removable newborn inlay that supports correct posture for babies up to 60 cm. This makes it a strong choice for parents who want a dedicated infant seat that grows with their child through the first two years.
The Doona+ also prioritizes safety, but its key advantage is the integrated stroller function. It does not include a separate newborn inlay — instead, the seat itself is designed to support newborns from birth. If your baby is very small or premature, the Cybex’s inlay may offer a more tailored fit.
Travel convenience and everyday use
The Doona+ shines when you are on the move. It converts from car seat to stroller in seconds, so you never need to wake a sleeping baby or juggle a separate stroller. This makes it ideal for parents who take public transit, taxis, or frequently hop in and out of the car.
The Cybex Aton B2 i-Size is lighter and more compact when used solely as a car seat. It clicks onto a base (included) for quick installation, but you will need a separate stroller for walks. If you already own a travel system or prefer a modular setup, the Cybex is a practical, budget-friendly option.
Price and value
The Cybex Aton B2 i-Size is priced at USD 145.96 (compared to USD 199.95), making it the more affordable choice. It includes the Base One, so there are no hidden costs for installation. The Doona+ costs USD 179.40 (compared to USD 299.00) and essentially replaces both a car seat and a stroller, which can save money if you would otherwise buy two separate products.
Decision rules: Doona vs Cybex
- Rule 1: Prioritize travel convenience: If you frequently switch between car and foot, the Doona+ is your best bet. Its one-second transformation eliminates the need for a separate stroller.
- Rule 2: Prioritize newborn-specific support: If your baby is very small or you want a dedicated newborn inlay, the Cybex Aton B2 i-Size offers a removable inlay that supports correct posture up to 60 cm.
- Rule 3: Consider your budget and long-term use: The Cybex is cheaper upfront at USD 145.96 and includes a base. The Doona+ costs more at USD 179.40 but replaces a stroller, potentially saving money if you buy fewer items overall. Think about whether you already own a stroller or plan to use the car seat as a travel system.
Product facts
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Cybex Aton B2 i-Size Car Seat including Base One: The Cybex Aton B2 i-Size is designed in compliance with the latest safety standards and includes a removable newborn inlay for babies up to 60 cm. The inlay helps maintain correct posture for very small newborns, and the i-Size compliance means it meets current European safety regulations.
Cybex Aton B2 i-Size Car Seat including Base One
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Doona+ Infant Car Seat - Nitro Black: The Doona+ Infant Car Seat transforms from car seat to stroller in seconds and features an improved all-black seat cover with enhanced breathability. You can move from car to sidewalk without unbuckling your baby, and the breathable fabric helps keep your newborn comfortable in warmer weather.
Doona+ Infant Car Seat - Nitro Black
Which car seat is right for you?
Best for
- Parents who need a car seat that doubles as a stroller for seamless travel (Doona+)
- Parents who want a lightweight, i-Size compliant seat with a newborn inlay (Cybex Aton B2)
Not for
- Parents who want a separate stroller with a full recline or a larger storage basket (choose a dedicated stroller instead)
