OBJECTIVE: To present an updated review about complementary feeding in infants and children under 2 years old. METHODS: Relevant materials from scientific journals, technical books and publications by international organizations were used. The most important source of data was a publication by the World Health Organization on complementary feeding carried out in Montpellier, France, in December 1995. RESULTS: In recent years, new findings on ideal infant feeding have buried former concepts and practices. The value of exclusive breast-feeding during the first months of life and the introduction of timely and adequate complementary feeding has been acknowledged. Complementary foods are defined as any solid or liquid foods with nutritional value other than breastmilk, offered to breast-fed infants It is recommended that complementary feeding be initiated around the 6th month of life. These foods should be rich in energy, proteins and micronutrients, free from contamination, easily digestible and in adequate amount. On recommending a healthy diet, the availability, accessibility and cultural values of food should be taken into consideration. CONCLUSION: Health professionals have an important role in the improvement of infant nutrition. Those in charge of child care have to be properly advised and warned of the importance of a healthy diet for current and future health status.