Social emotional development
Self-concept

Self-concept refers to the set of attributes, abilities, attitudes, and values that one identifies as defining who he or she is. Although some initial milestones occur before this period that support self-concept, including basic self awareness (i.e., the ability to recognize themselves in a mirror) and self-labeling of their gender, this period involves several advances in this domain. By 42 months, children are able to describe their likes and dislikes, suggesting a developing awareness of what elicits positive and negative emotions in themselves. By 5 years old, children demonstrate agreement with their mothers' ratings of their behavior on basic behavioral indicators of personality.
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