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Living with Epilepsy of infancy with migrating focal seizures

A rare form of epilepsy that starts in babies, with frequent seizures and loss of developmental skills.

Understanding Epilepsy of infancy with migrating focal seizures

Epilepsy of infancy with migrating focal seizures (EIMFS) is a form of epilepsy that begins early in life, usually before 6 months.

Babies may reach early milestones, but as seizures grow more frequent they often stop gaining new skills and may lose ones they had. Seizures usually start in one area of the brain and can move to other areas. They may occur several times a day. After a year or more, they may become less frequent. Seizures can affect brain growth, and many children have developmental delays.

Signs & symptoms

Symptoms vary from person to person. GARD describes:

  • Seizures starting before 6 months
  • Seizures that move from one brain area to another
  • Loss of skills already learned (developmental regression)
  • Unusually small head (microcephaly)
  • Low muscle tone (hypotonia)
  • Muscle stiffness (spasticity)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include seizure and epilepsy specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Epilepsy Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing help find the cause of my child's seizures?
Which seizure medicines or treatments are options?
What therapies can support my child's development?

Quick facts

GARD doesn't describe a cause for this condition in the information provided.

Also known as: eimfs; eimfs - epilepsy of infancy with migrating focal seizures; malignant migrating partial epilepsy of infancy

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Epilepsy of infancy with migrating focal seizuresGARD ID 26016 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Epilepsy of infancy with migrating focal seizures.

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