Febrile seizure is the most common type of seizure in children. It affects 2% to 5% of children between the ages of 6 months and 6 years1.
Approximately 2/3 of children will not have future recurrence after the first episode of febrile seizure2. On the other hand, 1/3 of the children will have recurrence of febrile seizures, until they reach 6 years of age2. Although febrile seizures can look frightening to caregivers, those lasting less than 15 minutes do not cause any long-term health problems such as brain damage. Febrile seizures lasting more than 30 minutes can result in complications such as lack of oxygen to the brain and thus seizures should not be allowed to continue for a prolonged period of time. Only 3% of children with febrile seizures may go on to have seizures not associated with fever, otherwise known as epilepsy3.
Source:
1PubMed,
2PubMed,
3PubMed