This article was published as part of the Office for National Statistics (ONS) Measuring National Well-being Programme and discusses the well-being of children aged 0 to 15. The Programme aims to produce accepted and trusted measures of the well-being of the nation - how the UK as a whole is doing. The article covers both objective and subjective measures of well-being. Areas covered include infant mortality, birth weight, satisfaction with relationships and access to and use of technology.