Attachment theory
Attachment theory has led to a new understanding of child development. Children develop different patterns of attachment based on experiences and interactions with their caregivers at a young age. Four different attachment classifications have been identified in children: secure attachment, anxious-ambivalent attachment, anxious-avoidant attachment, and disorganized attachment. Attachment theory has become the dominant theory used today in the study of infant and toddler behavior and in the fields of infant mental health, treatment of children, and related fields.