Communication Begins with Children: A Lifespan Communication Sourcebook seeks to transform the field of communication, arguing that the field must stop neglecting and segregating children and instead adopt an age-inclusive lifespan approach that fully includes and fully considers children in all communication theorizing, research, and education from infancy and throughout the human lifespan. One-size-fits-all, adult-centric communication theorizing, researching, and educating is inadequate and harms the communication field's potential as a social force for positive change for all communicators. The volume contains four sections (Foundations, Relational Communication Development, Digital Communication Development, and Navigating Developmental Communication Challenges) that showcase state-of-the-art chapters about the history of children's relational and digital communication studies, methods used to study children's communication, media literacy development, communication and children's health, and much more. A must read for all communication researchers, educators, and students and an important addition to advanced and graduate level human and digital communication courses.