PURPOSE:In infants born intrauterine growth retardation(IUGR), there may be persistent short stature in childhood and adulthood, although most IUGR infants show some degree of catch-up growth. The purpose of this study was to describe the postnatal growth status in order to determine the incidence of catch-up growth. METHODS:This study was carried out with the 260 IUGR infants(birth weight<2,500gm) born at Inje University Sanggye Paik Hospital, from October 1989 to March 1995. RESULTS: 1)Mean gestational age was 38.3+/-.6weeks, mean birth weight was 2.3+/-.2kg and mean birth length was 46.1+/-.7cm. 2)Mean height standard deviation score(height SDS) was 0.02+/-.03. Height SDS was -0.002+/-.71 at 1 year of age, 0.03+/-.14 at 2 years of age, -0.03+/-.71 at 3 years of age, 0.01+/-.24 at 4 years of age, 0.16+/-.24 at 5 years of age, -0.08+/-.43 at 6 years of age. 3)Of the entire study group of the 260 children, 16 children (6%) were below 10 percentile in height. 1 of 36 (2.8%) was below 10 percentile in height at 1 year of age, 5 of 86(5.8%) at 2 years of age, none at 3 years of age, 6 of 44 (13.6%) at 4 years of age, 1 of 25 (4.0%) at 5 years of age, 3 of 17 (17.6%) at 6 years of age. 4)Height SDS significantly correlated with gestational age (r=0.57, p<0.01), birth weight (r=0.17, p<0.01) and midparental height (r=0.72, p<0.01). 5)Birth length and midparental height showed significant differences between catch-up group and non-catch-up group (p<0.01). Condusions:In summary, of the infants born IUGR, 94% showed catch-up growth. Birth length and midparental height were significantly lower in non- catch-up group.