This is a new edition of a highly regarded text in the series on "Pain Research and Clinical Management". The book is now used as a standard reference text for those working in the field of neonatology and paediatric pain assessment and management. It provides a comprehensive resource of the latest information in the field for use by both researchers and clinicians. The text is intended for use by all professionals working in the field: neonatologists; pediatricians; anestheiologists; nurses; psychologists.