This article explores the impact of attachment and need theory on developmental stages in life cycle development. It discusses the different stages of development and how they impact physical, social, emotional, and mental aspects of an individual. The article also examines the theories of Mary Ainsworth, John Bowlby, Peggy Emerson, and Rudolph Schaffer, and how they relate to the case study of Sophie. Additionally, the article discusses Maslow's hierarchy of needs and how it applies to Sophie's situation.