Attachment is an adaptive & innate behaviour that evolved to increase an infant's chances of survival. Bowlby believed one main attachment, usually to the mother ( monotropy ) forms during a critical period of 3 - 6 months & provides a secure base for exploration. This main attachment helps keep the infant close to a caregiver who offers protection. Infants are born with social releasers which elicit caregiving. This main attachment forms an internal working model which acts as a template for future relationships>