An infant is admitted with tonic-clonic movement of the lower extremities.

Febrile seizuresare the mostcommon cause of seizures in infants and young children, typically between 6 months and 5 years. They often occur with arapid rise in body temperature, even inthe absence of intracranial infection or metabolic disturbances.

“In infants, febrile seizures are the most likely cause of new-onset seizures. Tonic-clonic activity confined to extremities is typical. Evaluation focuses on identifying the febrile source.”

(Referenced from CCRN Pediatric – Direct Care: Neurological, Pediatric Seizure Disorders)

Lead poisoning and structural brain anomalies are less common and usually not the first consideration in an acute setting with fever.