Supine length, weight and head circumferences of 10,241 neonates (5241 boys, 5000 girls, sex ratio 105) born in Arak (central Iran) in 2004 are reported. The mean plus or minus standard deviation of boys' and girls' (p value for sex difference) supine length (mm), weight (g) and head circumference (mm) were estimated as 501 plus or minus 30 and 497 plus or minus 31 (p less than 0.001), 3194 plus or minus 586 and 3100 plus or minus 532 (p less than 0.001), and 351 plus or minus 18 and 345 plus or minus 18 (p less than 0.001), respectively. Supine length and weight of our subjects were significantly lower than that of their American counterparts (p less than 0.01), but our boys' head circumferences were significantly higher than the NCHS reference data (p less than 0.01) while no significant differences was seen among girls. (Contains 3 tables.)