Modern technology has made possible epidemiological studies that relate aspects of neonatal health to disease in adult life. This symposium is the first to draw together information from this new research area. Explores links between early growth and the risk of high blood pressure, stroke and coronary heart disease in adult life; poor growth of babies and inadequate growth and nutrition of mothers; and levels of blood cholesterol and clotting factors. Other chapters consider the connections between early nutrition and adult immunocompetence and risk of allergic diseases; critical periods in the development of both the brain and visual system; and possible origins of schizophrenia. Examines the consequences of adverse early experiences for adult psychosocial functioning.