A two-yers longitudinal study waz conducted in 1996. the data are letated to a cohort of 317 healthy neonated(164 girls and 153 boys) randomly selected in june 1996 from the city of shiraz followed from birth to two years of age. Firstly. logistic regression model and HRY (Healy-Rashash-Yang)method were used on ten selected milestones separately. https://globechemicalcompanyls.shop/product-category/other/