This report describes the relationship between maternal malnutrition and child development. The report is divided into three sections. The first section, which describes child development, focuses on brain, mental, and psychomotor development. The second section describes the methodological difficulties of measuring effects of malnutrition on the brain, and focuses on the value and limits of animal experiments which investigate anatomical and behavioral modifications, and reversibility disorders caused by malnutrition. This section also describes difficulties encountered in field work. Areas of difficulty are those concerning psychometric tests and the measurement of intelligence and social competence, and the definition of test variables. An additional area of difficulty concerns investigations which include retrospective and prospective surveys and intervention-type investigations. The third section discusses the interaction between malnutrition, development, and environment. This section focuses on studies based on observation of interactions between: (1) malnutrition and development; (2) environment and malnutrition; and (3) mother and child. Research on relationships between poverty, growth, and development in Cali, Colombia, is also discussed. The report concludes with a glossary of the main psychometric tests and a list of books for further reading. (RJC)