This document discusses social and emotional development patterns in infants and toddlers from birth to 36 months. It covers several topics: - Emotional development theories including Erikson's psychosocial stages and Mahler's separation-individuation theory. - The influence of temperament and emotional intelligence on development. - The importance of secure attachment between infants/toddlers and their caregivers for social development. - The development of relationships with peers, self-esteem, and prosocial behaviors during this age. - Special considerations for children with developmental disabilities or disorders.