Abstract
Much of the knowledge about infant feeding practices comes from cultures undergoing rapid development, where a decline in lactation already exists. In order to delineate cultural baselines against which the impacts of development may be identified and measured, detailed ethnographic description of infant feeding practices in regions minimally changed by moderizing forces are required. This paper, based on 14 mo. of intensive ethnographic fieldwork, serves as baseline study in an area only marginally altered by economic development and identifies specific interrelationships between local economics, social structure and physical environment that define infant feeding patterns in the Usino area, Papua New Guinea.