Fever with seizures in newborns

Fever with seizures in newborns: Always dangerous

The occurrence of seizures in a newborn (up to 3 months old), regardless of whether they have a fever, is always an emergency situation that requires an immediate call for emergency services and hospitalization. Unlike benign febrile seizures that occur in older children, seizures in newborns are almost always a sign of serious central nervous system involvement.

Why isn’t this a "febrile seizure"?

Classic benign febrile seizures, by definition, do not occur in children younger than 6 months. A newborn’s brain is still too immature, and any seizure activity at this age indicates a profound disturbance of its function.

Most likely causes of fever-associated seizures in newborns

Physicians will first rule out life‑threatening conditions:

• Neuroinfection (meningitis, encephalitis): Inflammation of the meninges or brain tissue caused by bacteria or viruses (e.g., herpes simplex virus). Fever is a sign of infection, and seizures indicate brain involvement.
• Bacterial sepsis: A systemic blood infection in which toxins can affect the brain.
• Severe metabolic disturbances: A sudden drop in blood glucose, calcium, or sodium levels, which can be triggered by a serious infection.

Seizures in newborns can appear atypically (the so‑called "subtle" seizures), manifesting only as eye rolling, "chewing" or "swimming" movements, which makes them harder to recognize. Any unusual movement in the context of fever requires immediate medical assessment.