Tommy Tricker and the Stamp Traveller

It is a children's film in which a young boy, Ralph, and his sister discover a magical ability to travel the world, riding within postage stamps. Complicated by a series of rules, they are soon lost in such far-flung places as Australia and China. Ralph is plagued by a debilitating stutter, and the film is essentially a coming-of-age story wherein Ralph can speak unfettered by the film's end.