The items in the Denver Developmental Screening Test (DDST) have been restandardised on a random sample of 1547 Cardiff children aged up to six years. Some differences were found between the ages at which the Cardiff and Denver children achieved certain test items. Cardiff children were consistently slightly slower on gross motor items throughout the age-range, with the exception of three items, but were slightly more advanced on early language items below the age of 18 months and on some personal and social items. The implications of the findings for the use of the DDST in Britain are discussed.