The book informs and inspires Early Childhood Intervention (ECI) professionals regarding why and how to improve the attachment security of children, including those with a disability or developmental delay, within the context of best practice in ECI. It will help the audience understand the importance of attachment security to development, wellbeing, and participation, and why the formation of a secure parent-child attachment can be challenging for children with disability or developmental delay. Practical evidence-informed strategies to support positive parent-child relationships within the context of best practice in ECI will be discussed.