[Evaluating malnutrition in pediatrics, a current challenge].

Malnutrition in pediatric patients conditions their health/illness. Malnutrition in sick children further aggravates their baseline situation, and conditions their evolution and prognosis. Despite its relevance, it is not evaluated in many cases, nor is there a single definition that facilitates its diagnosis. The objective of this article is to establish the principal aspects to consider when evaluating malnutrition, and to highlight the importance of routine evaluation.