The period of intrauterine development constitutes one of the most vulnerable phases in the life cycle, with a lasting profound influence on subsequent growth. It is universally acknowledged that size at birth is an important indicator of foetal and neonatal health. Size at birth is the product of duration of gestation and rate of foetal growth. to evaluate the growth pattern of biparietal diameter (BPD) and head circumference (HC) of foetuses Assamese population, which is our local sample of population belonging to state Assam situating in the north-east part of country India. Materials and method: This study was carried out in Five hundred and fifty pregnant women attending to the Obstetrics and Gynecology outpatient department as well as those who were admitted as indoor patient in this department of Gauhati Medical College and Hospital. Results: Regarding the study group our demographic data Most of the pregnant women were within age group of 21-25(50 %). No. of cases between age group of 26-30 yrs is 220 (40%) and between age group of 31-35 is 40 (8%). No. of cases with 20 years and below is 11(2%) and no. of cases above 35 is 0. Discussion: The comparison of our result in the present study with Hadlock`s scale which was compiled in 1984 with help of his co-workers based mainly on Caucasian population and which is commonly used as reference chart for our foetal growth and also with the scale compiled by S.Campbell