This report reviews the methods used to estimate the national number of people eligible to participate in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) under full funding of the program. It reviews alternative data sets and methods for estimating income eligibility, adjunctive eligibility (which occurs when people are eligible for WIC because they are enrolled in other federal public assistance programs) and nutritional risk, as well as for estimating participation if the program is fully funded.

Abstract: This report provides information on the U.S. Dept. of Agriculture's (USDA) handling of the National WIC Evaluation and its current plans for a follow-on study of WIC's impact on children. The report discusses the problems USDA encountered in performing the National WIC Evaluation, which added to its cost and delayed its issuance; the reason USDA cancelled a follow-up study of WIC's effects on children; and the status of USDA's plans for a redesigned study of children. It also includes factors USDA may want to consider in planning and conducting future evaluations in order to produce less costly, more timely results.

USDA's Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) provides nutritious foods, nutrition counseling, and referrals to health and other social services to low-income women and their infants/children up to age 5. Despite the health benefits of WIC participation, many eligible women do not participate during pregnancy, and many households exit WIC when a participating child turns 1 year old. The authors of this report use the first two waves of the Early Childhood Longitudinal Study-Birth Cohort (ECLS-B) to understand these transitions into and out of WIC. Findings show that households that are more economically advantaged are more likely to delay entry into the program or exit after a child turns 1 year old. Some of the mothers exiting the program reported that WIC requires too much effort and that its benefits are not worth the time (26.2 percent of those exiting) or that they have scheduling and transportation problems (almost 10 percent of those exiting), suggesting that the costs of participation may be a barrier to continued WIC participation.

Review of WIC Food Packages: An Evaluation of White Potatoes in the Cash Value Voucher assesses the impact of 2009 regulation to allow the purchase of vegetables and fruits, excluding white potatoes, with a cash value voucher on food and nutrient intakes of the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) population and to consider whether white potatoes should be permitted for purchase with the voucher. This report considers the effects on diet quality, the health and cultural needs of the WIC population, and allows for effective and efficient administration nationwide in a cost-effective manner. Review of WIC Food Packages: An Evaluation of White Potatoes in the Cash Value Voucher recommends that the U.S. Department of Agriculture should allow white potatoes as a WIC-eligible vegetable, in forms currently permitted for other vegetables, in the cash value voucher pending changes to starchy vegetable intake recommendations in the 2015 Dietary Guidelines for Americans.

Started in 1974, the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) was designed to meet the special nutritional needs of low-income pregnant, breastfeeding, or postpartum women; infants; and children up to 5 years of age who have at least one nutritional risk factor. The WIC Program provides three main benefits: supplemental foods, nutrition education, and referrals to health and social services. Since the inception of the WIC program, substantial changes in size and demographics of the population, food supply and dietary patterns, and health concerns have made it necessary to review the WIC food packages. Proposed Criteria for Selecting the WIC Food Packages proposes priority nutrients and general nutrition recommendations for the WIC program, and recommends specific changes to the WIC packages.