The study highlights the nutritional status of two thousand nine hundred and sixty five (2965) numbers of Mising (a scheduled tribe) children of Upper Assam with the help of two derived nutritional indices i.e. Arm Fat Area (AFA) and Arm Muscle Area (AMA). The mean values and their descriptive statistics of AFA as well as AMA are presented for each group of children starting from 6 to 20 years of age. A sexual variation has been found in terms of the mean values of both the indices and is more marked in the early childhood and late adolescent period. With respect to the United States standard the Arm Fat Area indicates that Mising girls suffer relatively more than the Mising boys. On the other hand with respect to Arm Muscle Area Mising boys are found to be more sufferer than the girls. The Mising boys shows higher mean values for AMA than those of the girls whereas an opposite trend of sexual variation is found with respect to AFA. The results indicate that the boys tend to accumulate more muscle and girls more fat in their growth period. With the present study it can be said that to delineate the nutritional status of a particular community several parameters should be taken into consideration at a time to come to a final conclusion.