This work proposes a unified framework for understanding early memory development, nonunitary encoding, predictive processing, and their implications for media design in stable societies. Drawing on developmental neuroscience, cognitive psychology, and social-cognitive research, the paper argues that early memory is not a single system but a distributed configuration across cerebellar, limbic, somatosensory, autonomic, and gradually maturing hippocampal circuits. Infantile amnesia is interpreted not as erasure but as an access failure caused by rapid neural reorganization. The manuscript introduces a three-layer memory architecture—a deep bodily–affective layer, an intermediate episodic–causal layer, and a surface symbolic–narrative layer—and explains how these layers interact across development. The framework incorporates predictive processing, emphasizing how infants and children form probabilistic expectations about sensory, causal, and social regularities. To connect theory with practice, the paper analyzes how media structures (rhythm, pacing, conflict–repair cycles, role schemas, value atmospheres) interact with developmental memory formats and social challenges. Several integrative tables map developmental stages, neural substrates, memory formats, media features, and forms of social adaptation. The appendices provide practical guidance for creators, including recommendations for handling high-intensity stimuli (Appendix B) and a set of non-prescriptive structural evaluation metrics (Appendix C). These tools are intended to support creators without constraining artistic freedom; if superior methods exist, they should take precedence. Overall, the work aims to bridge scientific theory and creative practice by offering a developmentally grounded, structurally coherent framework for understanding how early experiences and media environments shape long-term cognitive, emotional, and social outcomes.