Classes of child-mother attachment disorganization from infancy to the preschool years.

Mary Main's operationalization of infant attachment disorganization contributed to our understanding of attachment and psychopathology. Her exploration of attachment patterns at age 6 with Jude Cassidy laid the foundations for studying attachment post-infancy. They found remarkable correspondence from age 1 to age 6 in the disorganization spectrum and documented the emergence of role-reversal. This study proposes a person-centered approach to explore classes of children with respect to attachment disorganization at four time points between infancy and late preschool. Participants ( n  = 205) were recruited in the UK and formed a socioeconomically diverse community sample of mother-child dyads. We identified three classes of children: 1) a stable organized group; 2) an unstable group becoming organized; and 3) an unstable group becoming disorganized. Results show that major loss predicts membership of the third class of children. These findings contribute to our understanding of disorganization across multiple periods, and thus to Mary Main's legacy.