Our guide to fitting a rearward-facing car seat using Isofix will help to ensure that your child's car seat is fitted correctly, and that your baby will be a The Cybex Aton B2 i-Size car seat is compatible with the Cybex Base One. To install, follow these simple steps: Hold the car seat using the handle. Slightly tilt the Aton car seat upwards. Hook the metal locking bar on the bottom of the car seat to the grey panel on the base. You will hear a click once the seat is securely in place. It won’t be 100% immovable. Completely normal as the isofix bars are like little square brackets, the hooks are narrower than the squares, so it will naturally move. Do all car seats fit any ISOFIX bases? Isofix seats will not fit in every car with Isofix points. As with any child car seat, follow the manufacturer's instructions carefully. No, Isofix bases are not the same. Most infant Isofix car seats come with their own Isofix base that installs firmly onto the car. At the same time, most toddler Isofix car seats use integrated bases. You can only use a base with a car seat of the same brand, which the manufacturer states are compatible. Also, Isofix bases are not all the same. Best overall toddler car seat: Maxi-Cosi Pearl Pro 2 i-Size | £164. Best budget toddler car seat up to age 12: Cozy N Safe Arthur | £130. Best 360 car seat for toddlers: Joie i-Spin 360 | £279. Best toddler car seat for safety: Axkid Spinkid | £399. Best toddler car seat for comfort: Cybex Sirona Gi i-Size | £280. Cozy N Safe Merlin, £299.99. Width: 43cm. Age suitable for: Birth to 18kg (around 4 years) Weight: 6.5kg. Installation: ISOFIX base only. A newcomer to the car seat industry, British brand Cozy N Safe have produced this 360-degree rotating Group 0+/1 car seat that’s rear-facing to 4 years. Even car seats that are considered ‘universal’ or ‘semi-universal’ are not guaranteed to fit correctly in every car. While R129 (i-Size) seats may be compatible with the car passenger seat, they may not be suitable for your child’s use. You must always check. Common Issues Fitting Car Seats. There are often a number of challenges when Maxi-Cosi's car seat base FamilyFix3 makes the installation of your Maxi-Cosi car seat even easier. The ISOFIX base attaches to the ISOFIX anchor points in your car and once installed, you can leave it in your car. The base's Click & Go installation ensures for a correct fit and makes getting in and out of the car very easy! l67Dy.