In Argentina the information about the characteristics of complementary feeding is scarce. The objective of the present study was to determine the age of incorporation and type of complementary foods in the diet of infants from a population of low economic resources. The study was carried out at the Forres District Hospital, Santiago del Estero, Argentina, using a structured questionnaire. Breastfeeding mothers were interrogated during the children's periodic control visits. A total of 240 surveys at 5, 6 and 7 months post-partum were made. The average age of incorporation of foods was of 4.4 months. The first introduced foods were purée (potato and pumpkin, with broth or soup), soup (with wheat grits) and apple. The percentage of children consuming some type of gruel at 5 months was of 51%. At 7 months, 94% consumed gruels and 62.5% had milk bottles. About 40% ate the family stew (vegetables, noodles and meat) and 30%, a "mate" (Ilexparaguariensis) infusion with bread. An early incorporation of foods with inadequate energy and nutrients densities was observed. There was also an early ingestion of gluten and a high proportion of cow's milk consumption. This situation could affect the normal development of these children.