This is the authoritative presentation of Attachment and Biobehavioral Catch-Up (ABC), the widely disseminated, evidence-based home-visiting intervention for parents of infants who have experienced adversity, such as homelessness, neglect, or institutional care. Vivid case examples--including one that runs throughout the book--illustrate the importance of responsive parenting for helping children develop secure attachments and key regulatory capacities. Over the course of 10 coaching sessions incorporating extensive in-the-moment comments and video feedback, ABC enhances parents' ability to follow their children's lead, nurture when children are distressed, and avoid frightening behaviors. In a readable, accessible style, chapters describe adaptations for different populations (high-risk birth parents, foster parents, parents who have adopted internationally, and parents of toddlers) and provide guidelines for training and implementation.