Understanding how children grow, think, feel, and respond to the world is essential for designing welcoming spaces, services, and experiences. This lecture provides an overview of four key dimensions of early childhood development—physical, cognitive, emotional, and sensory—and explains why they matter for planners, business owners, tourism professionals, and community leaders. When environments align with children’s developmental needs, they not only promote healthy growth but also attract families by providing comfort, value, and meaningful engagement.