Acknowledgments Jean Hay-Smith was the author of previous published version al this review See"other publishedvesions of this review'. José M Belizan was an author on previous versions of this review and Georgina Stamp was aco-author on the first version of this review. Dr Camoli visited theCochrane Pregnancy and Childbirth Review Group's editorial office in Liverpool in 1996 prepare the first version of this review, funded by a Shell Fellowship administered by the Liverpool School of Tropical Medicine. SOURCES OF SUPPORT Internal sources Human Reproduction, World Health Organization, Switzerland Centro Rosarino de Estudios Perinatales, Rosario, Argentina Secretaria de Salud Publica, Municipalidad de Rosario, Argentina Enteral sources No sourcesof support supplied