UNICEF says:

"Malnutrition is called an “invisible” emergency because, much like an iceberg, its deadly menace lies mostly hidden from view. Each year malnutrition is implicated in about 40% of the 11 million deaths of children under five in developing countries, and lack of immediate and exclusive breastfeeding in infancy causes an additional 1.5 million of these deaths. However, contrary to popular belief, only a fraction of these children die from starvation in catastrophic circumstances such as famine or war. In the majority of cases, the lethal hand of malnutrition and poor breastfeeding practices is far more subtle: they cripple children’s growth, render them susceptible to disease, dull their intellects, diminish their motivation, and sap their productivity."