Hi and welcome to HCM thanks for the query.Biliary atresia
is serious congenital anomaly and kasais procedure is the only chance for them despite transplanttaion. kasais procedure has high rate of complication and it is not always succesful.however these findings are still not alarming as this is expected after sucg surgeries and of course his liver
wont function as it was healthy.some elevation of lft is expected and he needs only frequent check up.
Wish you good health. Regards