Chapter 3 covers the journey of human development from birth through adolescence. We'll explore physical growth, shaped by factors like sex, hormones, and cultural nuances. The impact of family dynamics, peer cultures, and even teachers on social development is covered, alongside strategies for fostering empathy and combating challenges like bullying and abuse. We'll then delve into the internal world of identity and self-concept, navigating theories like Erikson's and Marcia's, while acknowledging the complex influences of race, ethnicity, and social norms. Finally, we'll look at the evolution of moral reasoning, from understanding intentions to building prosocial behavior, drawing insights from diverse perspectives like Kohlberg, Gilligan, and Haidt.