This book provides an evidence-based review of the child health programme (CHP) in the UK, for children from pregnancy to the age of 7 years. The book takes account of different government policies and different models of delivery of the CHP in the four UK administrations. It utilizes research from all over the world, but references the evidence to UK policy and practice. The aim is to summarize evidence about ‘why’ and ‘what works’ in health promotion and health surveillance with children and families, and where possible give guidance on ‘how’ to implement and quality assure a programme—but it does not conclude on ‘who’ should provide the service. The review starts in pregnancy, and considers evidence of how environmental exposures and maternal stress during pregnancy affect the developing fetus, and summarizes evidence of effectiveness for interventions during pregnancy and the perinatal period. The growing body of evidence for effectiveness in health promotion and primary prevention is appraised, and recommendations made to support services based on the principle of proportionate universalism. Evidence supporting secondary prevention, screening, and case identification through opportunistic surveillance is reviewed, together with the arguments for delivery of enhanced support to families with extra assessed needs and targeted services for families with specific risk factors. To conclude, evidence-based recommendations are made for the organization and quality assurance of the CHP, and areas highlighted where more research evidence is needed to support practice. Learning links to online training and resources are provided for each chapter.