Head size attract particular attention in infancy. Head circumference (HC) is one of the anthropometric parameters included in physical examination of infant and toddler. This measure of cranial growth gives a global indication of growth and development of the brain. Normally at birth, head circumference is larger than chest circumference. By the age of four months, the head circumference equals the chest circumference and later the chest circumference is larger than head circumference except in the presence of malnutrition. The present study is longitudinal study based upon children of two endogamous groups i.e. Jat sikh and Bania. A total 160 male children (80 each group) ranging in age from birth to 3 years were measured anthropometrically at the interval of 3 months in first 2 years and then after 6 months up to the age of 3 years. The head growth is most rapid within the first three years of life, primarily owing to the development of brain. Finding of the present study shows the general pattern of growth is characterized by a period of rapid initial increase from birth to 9 months followed by period of slower increment during 9 to 12 months and 18 to 21 months.