Duct atresia is a rare disease of unknown origin. It is characterized by obstruction of the bile ducts, and appears during the first weeks of life.
Your child is partially or totally lacking in bile ducts. The bile that normally flows through these ducts from the liver to the intestine stagnates in the liver.
This causes liver dysfunction, which then causes your child's jaundice. It is the most common cause of neonatal cholestasis (biliary retention).
It is a rare disease and affects 1 live birth in 18,000 in Europe. Girls are affected a little more often than boys.
Bile duct atresia is characterized by discoloration of the stool associated with an increase in the size of the liver.
A stool color chart can be used to help with its diagnosis, which you can view/download here.