This Penn State Push & Pull toy is designed with extended playability. It is made to last as baby grows, develops, and learns. Baby friendly products help your little fan grow healthy and happy. Growth & Development toys assist gross motor skills, movement & motion, and creative play. Help baby develop gross motor skills and hand-eye coordination. Learns to sit up and builds strong new muscles to push the toy. As baby begins to walk, learns to pull the toy by the attached cotton string. Wood wheels roll smoothly following baby. Develops powers of imagination to have fun during self-directed creative play. This real wood toy with Pull String is 100% Baby Safe made with real wood, non-toxic colors & finishes, and free of BPA, phthalates, & formaldehyde.