If a Newborn’s Golden Stool Turns Gray, Suspect Biliary Atresia

A newborn’s diaper may reveal biliary atresia before the baby appears seriously ill. If stool changes from golden yellow to gray or white, parents should not dismiss it as a minor digestive problem.

Biliary atresia affects about one in every 10,000 births. The congenital disease blocks the ducts that carry bile from the liver to the small intestine. Without bile in the intestine, stool loses its normal color. Bile also builds up in the liver, continually damaging liver cells and potentially leading to fibrosis and cirrhosis.

Unlike bile duct obstruction in adults, which often results from gallstones or tumors, biliary atresia in children involves widespread damage and contraction of the ducts. Its exact cause remains unknown, although an excessive immune response, possibly triggered by a viral infection, is suspected.

Jaundice is another common symptom, but it can be difficult to distinguish from the physiological jaundice seen in many healthy newborns. Stool color therefore deserves particular attention. Doctors begin diagnosis with blood tests, including bilirubin measurements, and imaging such as abdominal ultrasound and MRI. If suspicion remains high, cholangiography under general anesthesia can confirm the diagnosis.

There is no drug that can reopen the blocked ducts. The Kasai procedure removes the obstructed ducts outside the liver and connects the liver directly to the small intestine so bile can flow again. The earlier it is performed, the better the chance of preserving liver function. Even after surgery, however, internal liver damage may continue. About one in three affected children may need consideration for a liver transplant within the first one to two years, and around half receive a transplant by about age 10. Long-term care includes preventing and treating cholangitis, supporting nutrition and growth, monitoring liver function, and coordinating pediatric surgery, gastroenterology, infectious disease, nephrology and transplant teams.