PURPOSE: Early identification and treatment of developmental disabilities is of considerable importance in the health care of children. Screening of development is aimed at identifying infants who may need more comprehensive evaluations. METHODS: A new test, the Ewha Infant Development Screening Test(EDST) has been created to screen the development of infants, 0-4 years of age. EDST was constructed so that results can be calculated into developmental ages and developmental quotients. The test consists of three sectors, e.g. language, social-adaptive and motor, and of 158 test items. A total of 104 infants, aged from one month to four years, including healthy infants as well as 10 with chief complaints of developmental delay, who visited the pediatric clinic of Ewha Womans University Dongdaemun Hospital, from June, 25 to November 30, 2001, were given the Bayley Scale of Infant Development as a base test and EDST. RESULTS: The result showed the appropriate cut-off of EDST was 90 with better sensitivity and specificity, compared to cut-offs of 85 or 80. CONCLUSION: Further study with a large number of infants in the future is needed to make EDST more reliable and accurate.