This study was to investigate the nutrient intake of infants according to the 3 feeding groups which are as follows : breast-feeding(BF), formula-feeding(FF), mixed-feeding(MF) infants. Intake was compared between these 3 groups and present Korean RDA at 2month of age. The energy and the nutrient intake in the FF infants were significantly higher than in the BF infants and MF infants(p<0.05). Unfortunately, the energy and nutrient intake in all groups still do not meet RDA, excluding iron intake in FF infants. It might be suggested that follow-up study is needed to inspect whether the significant lower intakes of energy and nutrients in BF infants than in FF infants can bring about some significant effects on the growth of the infants.