What can increase a child's chances of recurrent febrile seizures?

Febrile episodes: Any febrile illness or vaccination especially combined one, e.g., mmrv, can trigger febrile seizure in febrile seizure-prone child. One assuring fact is that once child reaches 6 years old, he/she no longer experiences febrile seizure.

Certain illnesses: Children are at risk for seizures during certain types of illnesses. Most famous are roseola, shigella, measles, but also flu and urine infections. The risk is highest between 1 and 3 years of age, and there may be a familial tendency. Nearly all will outgrow the risk and do well.