In early infancy, when most features of the CCFDN syndrome have yet to appear, a differential diagnosis to be considered is galactokinase deficiency, an inborn error of metabolism common among the Roma which, if untreated, leads to the development of cataracts in the first weeks of life [14,15]. The gene discussed is GALK1; the disease is hyperinsulinemic hypoglycemia, familial, 4.