Any early infantile epileptic encephalopathy in which the cause of the disease is a mutation in the SCN2A gene. The disease is MONDO_0013388 (developmental and epileptic encephalopathy, 11). Also known as: DEE11, EIEE11, SCN2A early infantile epileptic encephalopathy, developmental and epileptic encephalopathy 11, early infantile epileptic encephalopathy caused by mutation in SCN2A, epileptic encephalopathy, early infantile, 11, epileptic encephalopathy, early infantile, type 11.