The theory of attachment goes back to the 1950s. John Bowlby put forward the theory that there will be positive benefits to an infant’s mental health if they experience a warm, intimate and continuous relationship with their mother or other close adult. Early secure attachments contribute to: love of learning, sense of self, positive social skills, successful later relationships, emotional understanding, commitment and morality.
National Scientific Council on the Developing Child (2004). Young Children Develop in an Environment of Relationships: Working Paper No. 1.