Ronald G. Barr, MDCM, FRCP-C Vancouver, British Columbia, Canada. Ronald G. Barr, MA, MDCM, FRCP-C, developed and tested prevention materials referred to as the Period of PURPLE Crying in collaboration with Marilyn Barr. He is the Canada Research Chair in Community Child Health Research at the University of British Columbia and Professor of Pediatrics in the Faculty of Medicine at UBC.

• 1. Introduction: crying as a sign, a symptom and a signal: evolving concepts of crying behavior Ronald G. Barr, Brian Hopkins and James A. Green; 2. Can we hear the cause of infants' crying? Gwen E. Gustafson, Rebecca M. Wood and James A. Green; 3. Crying as an indicator of pain in infants Kenneth D. Craig, Cheryl A. Gilbert and Christine M. Lilley; 4. Colic - the 'transient responsivity' hypothesis Ronald G. Barr and Megan Gunnar; 5. Clinical pies for etiology and outcome in infants presenting with early increased crying Liisa Lehtonen, Siobhan Gormally and Ronald G. Barr; 6. Crying complaints in the emergency department Steven Poole and David Magilner; 7. Crying in the child with a disability: the special challenge of crying as a signal James A. Blackman; 8. Toddlers' temper tantrums: flushing and other visible autonomic activity in an anger-crying complex Michael Potegal; 9. Acoustic cry analysis, neonatal status and long-term developmental outcome James A. Green, Julia R. Irwin and Gwen E. Gustafson; 11. Crying in infant primates: insights into the development of crying in chimpanzees Kim A. Bard; 12. Development of crying in normal infants: method, theory and some speculations Brian Hopkins; 13. The crying infant and toddler: challenges and promissory notes Ronald G. Barr, Brian Hopkins and James A. Green; Index.

'... up-to-date information on the latest research on crying' Scandinavian Journal of Behaviour Therapy 'The authors' summary of current knowledge of infant crying is comprehensive and well presented ... The book is helpful for those who deal with infant development, especially those interested in developmental psychology.' The Lancet 'It is very welcomed and instructive for those interested in or dealing with infant crying, especially from the scientific point of view. The book is excellent at presenting the state of art of infant crying and combines clinical and nonclinical fields together ... The book is undoubtedly valuable and includes extensive information for those dealing with cry research.' APA Review of Books 'A fascinating and informative book based on extensive research around the reasons why some infants constantly cry ... A book I would recommend to any unit that deals with infants and their parents. The information contained in the book will instill in the reader a firmer understanding about the complexity which surrounds the crying baby and will empower professionals to offer more effective interventions to the parent or carer to help resolve this very complex and stressful issue of the crying baby.' Accident and Emergency Nursing