-In each case, the child had recurrent episodes of severe hypoglycemia that were unexplained despite extensive investigations for endocrine and metabolic etiologies.-In each case, the child's attacks were resolved when he was briefly separated from his mother.-The diagnosis of factitious hypoglycemia imposed on another by proxy was confirmed following a scheduled change of the insulin assay in the laboratory. The gene discussed is INS; the disease is Hypoglycemia.