All of the following factors are associated with a substantially greater risk of developing epilepsy after febrile seizures, except:

Factors increasing risk of epilepsy after febrile seizures include family history of epilepsy, a typical seizures/complex nature of seizures and presence of a neurodevelopmental abnormality. Early age on onset increases the risk of recurrence of febrile convulsions. Ref: Febrile Seizures By Tallie Z. Baram, Shlomo Shinnar, Page 63; Essential of Pediatrics By O P Ghai, 6th Edition, Page 509