Fit4 day one to year ten the Chicco Fit4 4-in-1 Convertible car seat, designed to deliver premier child fit and comfort at each unique stage, makes it easy to correctly secure your child from birth through big kid booster. Trusted, easy-to-use installation and safety features unique to Chicco combine with an innovative 4-stage fit kit system, for ultimate convenience and peace of mind as your baby grows to age ten. One car seat – 4 stages to grow The 4-stage fit kit system provides optimal fit and comfort through multi-staged construction and easy-to-remove layers, providing more room TO grow through each unique stage. Combined with a two-position easy-adjust headrest and 9 recline positions, your child will be riding in comfort as they grow, correctly secured in each stage. Easiest all-in-one to install correctly chicco-exclusive installation features including recline Sure leveling system, ride Right bubble levels, force-multiplying SuperCinch LATCH tightener and lock Sure belt-tightening system combine to make Fit4 the easiest all-in-one Car Seat to install correctly. Slim design and space-saving CupFolders make Fit4 easy to fit and secure inside your vehicle. Protection at every stage duoguard side-impact protection Offers two layers of protection with a steel-reinforced frame and EPS energy-absorbing foam that surround the head and torso throughout every stage. A two-position headrest adjusts in height simultaneously with the 5-point harness to accommodate maximum growth, for best in class protection from birth through booster. Fit4Stages. Some as your child grows, scan the QR code on the side of the car seat