The authors describe the eletroclinical aspects and long-term evolution of five (in one male and four female patients) cases of early infantile epileptic encephalopathy. In the neonatal period, the most common seizures were tonic spasms (either generalized or lateralized) that, very often, occurred in series. All newborns showed the typical suppression-burst pattern. The neurological status (initially normal) progressively deteriorated in the subsequent months, and all infants suffered from severe mental insufficiency and daily intractable seizures. Four out of the five children developed hypsarrythmia and one, Lennox-Gastaut syndrome. The authors discuss the main problems related to the suppressionburst pattern and the long-term prognosis of this abnormality.