Any early infantile epileptic encephalopathy in which the cause of the disease is a mutation in the UBA5 gene. The disease is developmental and epileptic encephalopathy, 44 (MONDO_0014933). Also known as: DEE44, EIEE44, UBA5 early infantile epileptic encephalopathy, developmental and epileptic encephalopathy 44, early infantile epileptic encephalopathy caused by mutation in UBA5, epileptic encephalopathy, early infantile, 44, epileptic encephalopathy, early infantile, 44; EIEE44, epileptic encephalopathy, early infantile, type 44.