In 1906, Sir George Newman’s ‘Infant Mortality: A Social Problem’, one of the most important health studies of the twentieth century, was published. To commemorate this anniversary, this volume brings together an interdisciplinary team of leading academics to evaluate Newman’s critical contribution, to review current understandings of the history of infant and early childhood mortality, especially in Britain, and to discuss modern approaches to infant health as a continuing social problem. The volume argues that, even after 100 years of health programmes, scientific advances and medical interventions, early childhood mortality is still a significant social problem and it also proposes new ways of defining and tracking the problem of persistent mortality differentials.