The KeyFit 30 infant car seat accomodates infants from 4 to 30 lbs. The car seat harness has one-pull tightening & loosening for quick harness fitting. The thickly-padded infant insert gives extra support for a smaller baby around the head, neck, back & bottom. The carrier shell is lined with energy absorbing foam. It features an innovative LATCH management system, easy belt routing and a spring-loaded leveling foot to make the infant car seat installation easy. The "one-pull", centrally located tightening strap has made securing the LATCH attachment simple. The KeyFit base also has wide belt routing loops with a built in belt locking system for vehicles without LATCH. Leveling the base is easy with a spring-loaded leveling foot and easy to read liquid, bubble level guides on both sides of the base. The enclosed underside of base protects vehicle seats from damage. Conforms to "NEW" FMVSS 213. Usage: from 4-30lbs, newborn insert from 4-11lbs.