In India, children living in the backward and drought-prone areas, urban slums and those belonging to the socially backward groups like scheduled castes and tribal communities are highly susceptible to undernutrition. But condition is worst among the scheduled tribal communities. Most of the tribal people of India have their own geographically isolated life style. Inadequate food habits along with traditional socio-cultural and biological activities may lead to high proportion of child undernutrition. A total number of 100 Oraon Tribe boys and 100 Non-Oraon boys were selected as subjects for the study.The data was collected on students of school. They were grouped into two groups- Oraon and non Oraon. The mean CI index varied between 72.35 to 78.08 in OT and NO both. The highest value for this index was observed at 11+ and 17+ years in both groups respectively, while the lowest value was observed at 8+ and 15+ years in both groups respectively.