Nancy Krebs shares the findings of a study concerning micronutrients deficiencies in breastfed infants and toddlers, a research performed on children from different countries, with similar feeding settings. The study revealed that the diet of most of the children, who were part of the investigation, lacked the proper amounts of iron and zinc for a good nutrition, which may have consequences on the brain development and affect their growth.

She explains that complementary feeding refers to providing children with food, other than breast milk, which will help them meet their energy and micronutrient needs, fulfilling the corresponding quantities of zinc and iron from quality food. Krebs presents worldwide guide principles for complementary feeding, stating that meat, poultry, fish or eggs, should be eaten as often as possible.

She summarizes her conclusions and results and suggests a combination of strategies to achieve, as best as possible, a child's good nutrition.