The First Thousand Days: Motherhood, Scientific Knowledge, and Local Histories.

Since 2013, South African nutrition policy focuses on "the first thousand days," (conception to two years), informed by Developmental Origins of Health and Disease research. Drawing on ethnographic research, we show how policy foregrounds certain categories of persons and casts "the maternal" as a time frame for interventions to secure future health and argue that this constitutes a "knowledge effect" - the outcome of framing questions in a particular way and with specific knowledge horizons.