The Food and Nutrition Technical Assistance Project (FANTA) conducted four major studies in Bangladesh, Burundi, Guatemala, and Malawi examining interventions aimed at preventing undernutrition during the first 1,000 days. The studies yielded important lessons learned, programmatic implications, and recommendations on implementing the preventing malnutrition in children under 2 approach and on using micronutrient powders and small-quantity lipid-based nutrient supplements to improve nutritional outcomes among pregnant women and children.