To investigate the energy, protein, lipid, and lactose intakes of breast-fed infants of lacto-ove-vegetarians, 25 infants(13 boys, 10 girls) were examined on the 0.5th, 1st, 2nd, and 3nd months of lactation. The amount of breast milk intake was determined by a test-weighing method, and the energy content of protein, lipid, and lactose was calculated using the Atwater factor. Thedaily energy intake for boys averaged 316, 436, 447, and 431kcal and that of girls averaged 284, 399, 401, and 390kcal during lactation, respectively. Average energy intake of boys from milk from 2nd week to the 3rd month postpartum was significantly higher than that of girls(p<0.05), because milk intake volume of boys was much higher than that of girls. The protein intake of boys on 2nd week-3rd month averaged 7.33g/day and that of girls averaged 6.29g/day. The lipid intake of 2nd week, months averaged 21.8g/day and that of girls averaged 20.1g/day. The lactose intake of boys averaged 45.48g/day, while that of girls averaged 41.09g/day. The mean intake of protein and lactose in boys was significantly higher than that of girls.