en پژوهشي اصیل Original Research <p><strong>Background and Objective</strong><strong>:</strong> Achievement of motor skills is an important part of childhood development. There are some scales that commonly used for preschool-aged children including Peabody Developmental Motor Scales, 2^nd edition (PDMS-2). A cross sectional study designed to compare motor skills of high risk and normal infants of 3 to 6 months of age.</p> <p><strong>Methods</strong><strong>:&nbsp;</strong>In this case control study, 45 high risk infants 3-6 month of age were compared with 45 normal cases that matched for age and sex, for evaluation of motor development by PDMS-2. Subjects were selected by cluster sampling from different health centers of Tehran. Data about gross, fine and total scores were analyzed using SPSS software version 13.</p> <p><strong>Results</strong><strong>:&nbsp;</strong>There was a significant difference between gross, fine and total motor scores in normal and high risk infants with perinatal risk factors (P<0.05).</p> <p><strong>Conclusion:&nbsp;</strong>Fine, gross and total motor scores in normal and high risk infants of 3- 6 months old are significantly different. It is recommended to evaluate movement development by PDMS-2 in mentioned infants and starting rehabilitation as soon as possible</p> 4 7 http://ijca.iums.ac.ir/browse.php?a_code=A-10-1-20&slc_lang=en&sid=1 Hossein Karimi 1003194753284600157 1003194753284600157 No Rehabilitation and Neurology Research Center Faranak Aliabadi 1003194753284600158 1003194753284600158 No Faculty of Rehabilitation Sciences Mostafa Hosseini Jam 1003194753284600159 1003194753284600159 No Ladan Afsharkhas dr.afsharkhas1@yahoo.com 1003194753284600160 1003194753284600160 Yes