The document discusses several key topics in social and personality development in infancy, including: 1) Stranger anxiety and separation anxiety emerge between 6-14 months as infants develop social bonds and ability to recognize familiar people. 2) Facial expressions and ability to interpret emotions develops between 4-7 months as infants learn social cues. 3) Theory of mind roots emerge around age 2 as infants start to understand others' behaviors and beliefs. 4) Attachment styles form through interactions with caregivers and impact later relationships. Sensitive caregiving promotes secure attachment.