Objectives: The present work aims at studying malnutrition and anemia in children under 5 years of age received in consultation and / or hospitalized at the pediatric ward of Abomey-Calavi / So-Ava Zone Hospital in the Department of the Atlantic in southern Benin. Methods and Results : The study is carried out on 301 children received in consultation and / or hospitalized and their mothers are subjected to a questionnaire elaborated for this purpose. Anthropometric indices were calculated using the WHO Anthro® software. Biological data were collected from the children's files. 25.25% of the children were emaciated, 24.25% were stunted and 31.89% were underweight. In addition, 56.48% of children suffered from anemia. Of these, 30% had severe anemia, 13.53% had moderate anemia, and 56.47% had mild anemia. 58.83% of children have normochromic anemia and 72.94% have microcytic anemia. The main cause of the identified anemia is iron deficiency due to an insufficient dietary intake of iron and / or a loss of iron by the body caused by parasitic infections (malaria, intestinal worms) and bacterial infections. Conclusion and Applications of the results : It emerges from this study that malnutrition (in its various forms) and nutritional anemia remain a public health problem among the child population of the Commune of Abomey-Calavi. It is then necessary to reinforce the sensitization sessions and a nutritional education of the population on the good habits of food and hygienic. A policy favoring iron supplementation, and malaria control and deworming reduction systematic reduction of children would reduce the incidence of anemia