The Chicco Element KeyFit 30 Infant Car Seat is for use with babies from 4-30 lbs. It's the premier car seat for safety, comfort and convenience and is rated #1 as the easies car seat to install correctly. Car seat features a removable newborn insert to use with baby from 4-11 lbs. Insert provides extra protection for your newborn. The KeyFit 30 features a thick cushioned seat which includes a 5 point harness and EPS energy absorbing foam for increased safety and comfort. The easy to install base features a spring assisted level foot, two bubble levels, and center pull LATCH to make installation easy and secure. Base included with car seat. The KeyFit 30 Infant Car Seat is compatible with the following Chicco strollers: Cortina, Cortina Together, Trevi and S3.