Inability to metabolize galactose with associated hypoglycemic crisis, diarrhea, vomiting, dehydration, cataracts, hepatomegaly, and ascites; due to deficiency of galactose-1-phoshpate uridyltransferase. Onset is shortly after birth, with severity ranging from milk intolerance to significant deterioration and death. Treatment is galactose-free diet and (in severe cases) liver transplantation.