This project assessment discusses the application of psychological theories in health and social care. It explores Piaget's Cognitive Developmental Theory and Erikson's Psychosocial Theory in the context of infancy. The report also highlights the impact of human cognition, emotions, and behavior patterns specific to the identified life stage. Additionally, it provides insights from recent research studies in health and social care, focusing on children and young people's mental health, patient responsibility for lifestyle change, and reducing risk of harm in primary health care.