Chicco KeyFit Infant Car Seat Head & Body Insert Replacement Gray Nottingham Pre-owned. Good condition. Normal signs of wear. Smoke free and pet free home and car. Style: Nottingham Replace the head and body insert on your KeyFit Infant Car Seat or KeyFit 30 Infant Car Seat. The body insert is designed to help ensure a better fit for infants who weigh between 4 and 11 lbs. The head insert can be used with or without the body insert. Compatible with all KeyFit and KeyFit 30 models, including those purchased as part of a travel system. Head Support for infants Body Support for infants