Are seizures more common after the first time (had fever)?

Yes: Febrile seizures do tend to recur (30% chance after first episode). There is a 50% chance of recurrence if the child is less than age 1. After two febrile seizures the recurrence risk is 50%. Other factors that increase recurrence are family history of seizures, a complex febrile seizure (>15minutes or focal/one sided), daycare, duration of fever <24 hours, and fever 38 to 39 degrees celcius.