We report a boy with benign familial seizures of the sixth month of li
fe. At the age of six months he suffered his first afebrile grand mal
seizure. Up to his ninth month several seizures of the same type occur
red. EEGs were always normal. The history yielded a paternal hereditar
y trait: five members of the family had also suffered grand mal seizur
es in the sixth month of life. All but one had no therapy with antiepi
leptic drugs. One girl was treated with phenobarbital for two years. A
ll members of the family show normal neurological development. Under l
ow dose therapy with phenobarbital our patient has remainded seizure-f
ree up to now.