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Living with Atypical Rett syndrome

A brain development condition in which a child has some, but not all, of the features of Rett syndrome, mostly in girls.

Understanding Atypical Rett syndrome

Atypical Rett syndrome is a neurodevelopmental condition diagnosed when a child has some symptoms of Rett syndrome but does not meet all the diagnostic criteria.

It mostly affects girls. Symptoms can be milder or more severe than in classic Rett syndrome. Diagnosis relies on a clinical exam using criteria defined by Hagberg in 1994, and genetic testing may confirm it. It is noticed in newborns.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Intellectual disability
  • Trouble speaking or no speech
  • Trouble walking or coordinating movement
  • Breathing pattern differences
  • Feeding difficulties
  • Sleep problems

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 brain and nervous system specialists, genetic specialists and 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

    Rett Syndrome Research Trust, International Rett Syndrome Foundation and Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Rett Syndrome Research Trust, International Rett Syndrome Foundation, 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 Rett Syndrome Research Trust and other patient organizations
  • 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
Would genetic testing help confirm the diagnosis?
Which therapies help with movement, communication, and feeding?
How can sleep and breathing patterns be managed?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Dominant, X-Linked

GARD says changes in genes (also called variants) cause this condition. It can be autosomal dominant or X-linked.

GeneticNeurological

Also known as: atypical rtt; rett like syndrome; rett syndrome variant

Patient organizations

Source: NIH GARD · Atypical Rett syndromeGARD ID 4694 · 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 Atypical Rett syndrome.

Explore the Atypical Rett syndrome blog

Explore research for Atypical Rett syndrome

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  • Recruiting studies from ClinicalTrials.gov
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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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