Baby Alive Doll Stroller Travel System The Stroller can Fit Dolls up to 18 inches, and car seat up to 16 inch Baby Dolls. Stroller has steel frame with plastic bottom faring, plastic rims with EVA tires (similar to real stroller tires). Also features a retractable canopy and when the Car Seat clicks in - it creates a Doll Travel System. The Car Seat is a Plastic Shell with moulded hearts on the side which click into the stroller.