Child under nutrition is a serious issue and burning public health problem worldwide. Pre-school children usually require special care. It is evident that pre-school children suffer highest prevalence of mortality and sufferings of disease. If malnutrition starts in early stages of life it is difficult to recover. According to World Health Organization under nutrition of children requires immediate attention. Number of ethnic communities live in Bangladesh with diverse life style. This diversity makes them distinct area of study. Socio-economic characteristics and food habit are considered as strong determinant of nutritional status. We know that Bandarban is the remotest hilly district of Bangladesh. Internally migrated people are gradually settling there from nearby districts. Geographical variation may affect their social status, dietary intake and anthropometry as well. Findings of this research are helpful for policy maker and planner to design and implement public health programme specifically designed for them by using local resources.