The goal of the study is to be a current examination of infant and toddler feeding practices among families receiving WIC services. It has been more than 10 years since the last study of such feeding practices, and in the interim important changes have taken place in the WIC program, in society, and in the science of nutrition. The study will include exploration of breastfeeding practices and support, more general feeding practices, nutritional intake of infants and toddlers, transitions in infant and toddler feeding practices, early precursors of obesity, and family factors that may influence all of these nutrition-related issues. It will also explore characteristics of the WIC program in selected sites, and how these relate to infant and toddler feeding decisions and practices. This study is important both to update knowledge about the WIC population, and to uncover possible new avenues of inquiry regarding early childhood obesity.