0-7 years. Maxi-Cosi Beryl is a multi-age car seat that will grow with your child. Well suited for safe, comfortable and long-term travel use. This car seat is easy and quick to install and remove using both ISOFIX and seat belts. The car seat can be deployed both in the direction of movement and against it. When creating the Maxi-Cosi Beryl, G-CELL technology was used, which maximally protects against side impacts.