The term growth refers to changes in the quantitative increase in size or mass of an organism. Studies on the growth performance of children are of the utmost importance as an index of nutritional status for the community. A cross-sectional study was done in Maynaguri, Jalpaiguri district of West Bengal, India among 414 subjects out of whom 209 (50.48%) were boys and 205 (49.52%) were girls aged 2-5 years. The present investigation aims to study sex and age-specific growth patterns and to assess the grades of thinness. A total of five anthropometric measurements and one derived variable that is BMI were used in the present report. International cut-off values developed by Cole et al., 2007 were used for evaluating the grades of thinness among studied children. Mean values of all anthropometric variables were significantly increased in both sexes with the advancement of ages except boys’ BMI. The prevalence of overall thinness was 56.94 % for boys and 47.8 % for girls. The growth pattern of Rajbanshi boys and girls was lagging behind the 50th percentile of international standards such as WHO 2007, NCHS 1977 and CDC 2000. It is necessary to develop regional standards of growth of children and should evaluate regularly for a better understanding of physical growth among children of different ethnicities.