In 2006, FNS asked the Institute of Medicine to review the WIC food packages. The IOM proposed major changes to improve nutrition and encourage breastfeeding but also expressed the concern that changes related to partial breastfeeding may have unintended consequences. The IOM recommended that FNS conduct an impact study evaluating the birth month breastfeeding changes to the WIC food packages. 

The analysis conducted in this study builds on these two strands of the literature and uses three alternate definitions of breakfast: Consumption of any food or beverage. Breakfast intake of food energy greater than 10 percent of the Recommended Dietary Allowance (RDA). Consumption of foods from at least two of five main food groups and intake of food energy greater than 10 percent of the RDA.