For fathers and mothers, teachers, counselors and psychotherapists alike, the physical and mental development of children is the pillar of foster work. Not only so that they spend their childhood in the greatest possible well-being, but so that they become adults with the necessary capacities to adapt successfully to an increasingly demanding world. With the experience of Rafael Guerrero in the dissemination of educational psychology, and the talent of Olga Barroso in the preparation of stories that illustrate, from metaphor and fantasy, how a child develops, this book explains the fundamental issues to ensure the acquisition of all these skills during childhood. The emphasis on emotional education and attachment are key to understanding how children should be treated to become safe, full and happy adults.