Coolest in car seats? Convertible car seats that are built to grow with your baby, while providing superior protection from their first ride. The Safety 1st Grow & Go has an advanced cushion system, QuickFit harness and 3-position recline. The Chicco NextFit Zip features a 9-position leveling system, SuperCinch LATCH tightener and Zip & Wash seat pad. The Britax Marathon G4.1 has a 10-position quick-adjust harness, 3-position recline and side-impact protection. Perfect for you and your babe.