Biliary atresia is a very rare disorder. About one in 10,000 to 20,000 babies in the U.S are affected every year. About 400-600 new cases are described in the United States each year (according to rarediseases.org). Biliary atresia seems to affect girls slightly more often than boys. Within the same family, it is common for only one child in a pair of twins or only one child within the same family to have it. Asians and African-Americans are affected more frequently than Caucasians. There does not appear to be any link to medications or immunizations given immediately before or during pregnancy.
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