This volume is the outcome of an international symposium held in Berlin, FRG, which brought together researchers in the field of infant development.The contributors are from Europe and North America, and have as their primary professional interest either pediatrics, biology or psychology. These fields, in spite of common involvement and large overlap, still have to overcome communication problems and differences in scientific approaches. The emphasis of this book is on the efforts of the participants towards reaching a mutual understanding. In spite of disciplinary diversity, the papers in this book complement each other, and set the scene for future multidisciplinary research and exchange in the field of infant development.