The Chicco KeyFit 30 is a top-rated infant car seat with a long history of millions of users and positive consumer reviews. The Chicco KeyFit 35 is the newest version of the KeyFit (released in 2020). The KeyFit 35 accommodates baby's growth up to 35 lbs and 32" for extended rear-facing use (versus 30 lbs and 30" with the KeyFit 30). In addition, the KeyFit 35 provides adjustable head support with a no-rethread harness.