Research was undertaken to determine what informal education practices lend themselves to the precocity in sensorimotor development noted among Bagandan infants in Uganda, relative to their American white and black counterparts. With the assistance of a Muganda midwife/nurse a prenatal questionnaire was answered by women visiting antenatal clinics in Kampala. Twelve of the mothers and their infants than participated in formal and informal observation, filmings, and tapings on a monthly basis. Additional information on infancy and on the practice of geophagy, soil eating, was obtained in interviews with the fathers, mothers, a traditional herbalist, and others. This report deals specifically with the comparative results on the Bayley Scale of Infant Mental Development and suggests that early culturally constituted experiences consisting of formal training in sitting behavior and positive and continual emphasis on a smiling social demeanor are related to precocious infant performances. Data tables, questionnaires in English and Luganda, and a bibliography conclude the report. (JH)