RecruitingBiliary Atresia Study in Infants and ChildrenLittle is known about the factors that cause biliary atresia nor the factors that influence disease progression. The purpose of this study is to collect the pertinent clinical information, genetic material and body fluid samples to enable investigators to address the following aims: To identify the gene or genes implicated in the etiology of BA; To characterize the natural history of the older, non-transplanted child with BA.