In 2009, the USDA implemented an interim rule that changed the prescribed foods in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC). Options for mother and infant dyads include a full breastfeeding package with no infant formula, a partial breastfeeding package with some infant formula, and a full formula package with a smaller postpartum food package for the mother. The changes were designed to encourage WIC mothers to choose breastfeeding for their infants.