However, incidence of seizure disorders and risk of recurrent febrile seizures are much greater among children with any of the following: Complicated febrile seizures Preexisting neurologic abnormalities Onset before age 1 year A family history of seizure disorders Dravet syndrome (severe myoclonic epilepsy of infancy) develops during early childhood; it has focal and generalized components (and thus is not clearly a type of generalized-onset or focal-onset seizure).