Attachment classification, the Minnesota researchers found, was not absolute destiny—sometimes attachment relationships changed in the course of childhood, and some children with anxious attachments went on to thrive. But for most children, attachment status at one year of age, as measured by the Strange Situation and other tests, was highly predictive of a wide range of outcomes later in life. Children with secure attachment early on were more socially competent throughout their lives: better able to engage with preschool peers, better able to form close friendships in middle childhood,
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