By PERRI KLASS, M.D. "In pediatrics, attachment is the emotional connection that develops between a young child and a parent or other caregiver. Attachment theory was developed in the mid-20th century by a British psychiatrist, John Bowlby , whose own upper-class British upbringing included the loss of a beloved nanny, and an early trip to boarding school. Mary Ainsworth, his student and later collaborator, devised what is known as the strange situation procedure , in which a 1-year-old is...