Early diagnosis of developmental dysplasia of the hip in newborns is essential if treatment is to be successful. Screening of newborns is appropriate because developmental dysplasia of the hip has a high prevalence [1] and significant morbidity [2, 3] and is treatable [4]. Screening by clinical examination alone has shortcomings [5], and the use of sonography for screening has been proposed [6]. The purpose of this article is to analyze the use of sonography in this regard.