Described in this report are the extramural activities for fiscal year 1983 of the Center for Research for Mothers and Children (CRMC). The CRMC is designed to advance knowledge about fetal development, pregnancy, and birth; to identify the prerequisites of optimal growth and development through infancy, childhood, and adolescence; and to contribute to the prevention and treatment of mental retardation, developmental disabilities, and other problems of childhood and adolescence. The extramural activities of the Center are administered through three branches: the Clinical Nutrition and Early Development Branch (CNED), the Mental Retardation and Developmental Disabilities Branch (MRDD); and the Human Learning and Behavioral Branch (HLB). The largest branch in the CRMC, the CNED has three sections: a Genetics and Teratology Section, a Pregnancy and Perinatology Section, and a Nutrition and Endocrinology Section. In June of 1983 the CRMC provided more than $119 million in support of over 1,000 research and research training projects concerned with the special health problems of children, mothers, and families. Information concerning each branch and section includes an overview, descriptions of the unit(s) involved, a summary of program activities, a table disclosing National Institute of Child Health and Human Development grants and contracts active during June 1983, descriptions of research activities, and a brief report of staff activities. (RH)