This training provides clinical mental health professionals with a comprehensive framework for integrating neurobiologically-informed attachment theory into playful interventions with young children (“littles”). The curriculum is deeply grounded in the foundational attachment research of John Bowlby and Mary Ainsworth, emphasizing the biological necessity of a secure base and safe haven for healthy development. By bridging these classic models with Daniel Siegel’s interpersonal neurobiology and Stephen Porges’ Polyvagal Theory, the course explores how neuroception—the nervous system’s subconscious evaluation of safety—functions as the gatekeeper for therapeutic progress. Participants will examine how trauma disrupts adaptive neural networks and shifts a child’s internal working model from one of safety to one of survival. Attendees will learn to move beyond interpreting difficult behaviors as intentional choices, instead viewing them through the lens of the stress response system (Social Engagement, Mobilization, and Immobilization). Moving beyond traditional behavioral interventions, this course teaches clinicians how to apply the '4 S's' (Seen, Safe, Soothed, and Secure) through specialized play-based rituals. Clinicians will learn to utilize externalization techniques, such as the 'Monster' metaphor, and sensory-rich interventions like the 'Nest' to help children reprocess traumatic memories within their window of tolerance. The training culminates in practical, transition-focused strategies that empower both the therapist and the caregiver to maintain a felt sense of safety and support the child’s regulation across multiple environments