Malnutrition, even in its milder forms, increases the likelihood of mortality from other diseases, and is thus one of the most important public health problems in developing countries. BASICS II has made nutrition, and Essential Nutrition Actions (ENA) in particular, a central piece of its child health package. The ENA approach, which targets pregnant women and children less than two years of age, comprises a group of evidence-based micronutrient and infant feeding interventions that protect, promote, and support exclusive breastfeeding, adequate complementary feeding, appropriate nutritional care of sick and severely malnourished children, and adequate intake of vitamin A, iron, and iodine. Countries that adopt the ENA approach modify it to suit their specific contexts and needs. For example, strategies that have been used successfully in recent years include Child Health Weeks, Community-based Growth Promotion (based on growth monitoring), community-level counseling on infant feeding, and food fortification. As ENA programs have developed, so have tools been designed and used extensively in the field to operationalize implementation. BASICS II and its collaborators have packaged available ENA materials in this convenient toolkit, which can be obtained in print and on CD-ROM or accessed online.