It was not even fifty years ago that developmental psychologists viewed infants as closed systems, cut off from their environment. It was only with the observation of infants that a remarkable shift occurred, resulting in a wide variety of perspectives on infants today. The volume edited by child and adolescent psychiatrist Annette Streeck-Fischer brings together the most important psychoanalytic developmental psychologies from Sigmund Freud, René Spitz, Margaret Mahler, Anna Freud, Melanie Klein, Donald W. Winnicott, Daniel Stern, Joseph D. Lichtenberg, Louis W. Sander, John Bowlby, Robert Emde, Peter Krause, Györgi Gergely, Peter Fonagy, and Mary Target. All of them have significant importance not only for developmental psychology but also for psychodynamic diagnostics and therapy. None of their concepts are outdated.