Today millions of children in the world have not got the appropriate growth. For this purpose, this study was performed to evaluate the growth process of children under 6 years old in Hamadan, in addition the surveying this process, the difference in growth of the children were compared and measured by the NCHS standard curve.

          This was a cross–sectional study that included the research section of  1700 children who was at the average ages of zero, 1, 3, 6, 9,12 months and  1.5 , 2 , 2.5 , 3 , 3.5 , 4 , 4.5 , 5 , 6 years . The selection standard of the children was the perfect physical health and without obvious mental retardation.
          Regarding the curved standard   the results showed that the 50^th percentile of boys and girls weight up to 4 and 6 months was increased.  Then with increasing the age up to 6 years the weight gradually was decreased, that this weight deduction is closer to the 5^th percentile of the standard in 18 and 24 months. The 50^th percentile of the children height has been decreased from 9 months up to 6 years too, and the 50^th percentile of  the head circumference from 18 months up to 6 years of age, constantly 
   and slightly decreased compare to the standard curve.

          The overall result show that breast feeding is enough for the children up to 6 months and satisfies the children needs. But the causes that decrease the children growth are the lack of mothers knowledge about preparing the supplemental foods and the time of beginning and also inappropriate pattern of nutrition at the time of breast feeding.