Cutis marmorata telangiectatica congenita (CMTC) is a rare condition. Less than 60 cases have been reported. We saw four patients who were born in Sydney, Australia, between April 1978 and September 1979. The homes of the four mothers were located within an area having a 19.2-km radius, a population of approximately 900,000, and an annual live birth rate of approximately 19,000. Two patients were male and two were female. All showed segmental involvement and early resolution. Hemiatrophy developed in three patients, but no other associated abnormalities were detected.