Fit4 is the easiest all-in-one car seat to install and use, from birth to booster. , , 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 FitKit 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 FitKit 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 10-position easy-adjust headrest and 9 recline positions, your child will be riding in comfort as they grow, correctly secured in each stage: , , STAGE 1 INFANT, 4-16 LBS, Premium support at base of seat lifts hips slightly to improve alignment. Side cushioning cradles arms and legs. Backrest provides proper head/chest posture to aid child breathing. , , STAGE 2 TODDLER, 12-40 LBS, Insert cushion provides comfort and improved lateral stability for toddlers. Easy to clean and long lasting durability for busy toddlers. One-piece construction protects base layer for continued durability as child grows. , , STAGE 3 PRESCHOOLER, 25-65 LBS, Seat cushion provides dual-density padding throughout the sloped, contoured shell. Comfort 5-Point harness padding for continued soft security as child grows. Industry leading harness slot height (20") to achieve optimal height allowance for older children. , , STAGE 4 BIG KID, 40-100 LBS, Includes booster mode seatbelt pillow, to continue comfort and encourage correct belt placement. Seat cushion provides dual-density padding throughout the sloped, contoured shell. 3 Recline Positions. The only All-In-One car seat that offers multiple recline positions for booster mode. , , Usage, The Fit4 is designed for children between 4-100 lbs. and up to 57" tall. , , Care and Maintenance, Machine wash in cold water using mild detergent. Hang to dry. For complete care and maintenance instructions, refer to the product's instruction manual