Brain Rules for Baby: How to Raise a Smart and Happy Child from Zero to Five by John Medina (PhD) explores the science behind early childhood development. The book examines how a child’s brain grows, emphasizing the role of relationships, curiosity, and emotional security in shaping intelligence and behavior. Medina provides practical strategies to foster cognitive skills, self-control, and resilience. Understanding these principles can help parents create an environment that supports both learning and emotional well-being from infancy onward.