Rett Syndrome: Symptoms, Causes, Diagnosis & Support

Rett syndrome is a rare brain disorder affecting movement, speech, growth, and other body functions. It mainly affects females, though males with related gene changes have been reported^1,4.

Early growth can look typical before a child loses skills already learned^1,3. Signs often emerge between 6 and 18 months, but timing and severity vary^3,5.

This guide explains the signs, causes, testing, care, and support options. It can help you prepare questions and plan the next steps.

Rett syndrome affects how the brain and nervous system develop. It can change movement, hand use, speech, learning, growth, and coordination.

Many affected babies appear to develop as expected during early infancy^3,6. They may begin sitting, crawling, using their hands, or saying words.

Development may then slow, and learned skills may fade^1,3. This loss of learned skills is called developmental regression.

Hand control, speech, and walking often become harder^2,5. Repeated hand motions may replace useful actions, such as reaching or holding objects.

Brain and head growth may also slow^4,6. Some children develop microcephaly, which means their head is smaller than expected^4,6.

The condition can affect many parts of the body. Problems may involve breathing, sleep, digestion, the spine, or heart rhythm^3,5,6.

Doctors describe the condition as classic or atypical Rett syndrome^1,4. Classic Rett syndrome has the best-known pattern of early growth followed by regression^1,4.

Atypical forms can be milder or more severe than the classic form⁴. Their severity may also differ^1,4.

Symptoms vary greatly from one person to another^3,6. Gene changes and other factors may help explain these differences³.

Two people with Rett syndrome may be affected to different degrees^3,6. A care plan should reflect the individual rather than a fixed stage.

Rett syndrome occurs mainly in females. However, males with MECP2 changes and related health problems have been documented^1,4.

People from any racial or ethnic group can develop the condition³. It is not linked to one specific population.

Some affected males develop severe brain problems during infancy⁴. Others have milder problems with movement, learning, or seizures⁴.

Many affected people need ongoing help with daily tasks. The type and amount of support differ for each person^3,6.

Rett syndrome signs often begin between 6 and 18 months. Early changes may be mild and easy to overlook.

A child may make less eye contact or lose interest in toys. Sitting and crawling may also be delayed.

Other early signs can include low muscle tone and feeding problems^3,7. Jerky limb movements or problems with crawling may also occur³.

Regression may occur over weeks or months. A child may lose words, hand control, social interest, or movement skills.

Changes can appear at different ages and progress at different rates. Some skills may remain, while others become limited or disappear.

Doctors look for four core features during an assessment^2,5. These features include:

Hand motions may include wringing, clapping, squeezing, tapping, rubbing, or mouthing. The exact motion differs between people.

Apraxia means the brain has trouble planning a known movement. It can affect speech, eye control, and other motor tasks^1,3.

Some people later regain better eye contact or nonverbal communication. Movement problems may remain even when behavior or communication improves^6,7.

Many people with Rett syndrome develop seizures during their lives. More than one seizure type can occur.

An electroencephalogram may show changes in brain activity. This test is often shortened to EEG.

Breathing patterns may change while a person is awake^3,6. These patterns can include breath-holding, fast breaths, forceful exhaling, or swallowing air^3,6.

Sleep may involve shallow breathing or brief pauses. Other sleep problems include night waking or sleeping during the day.

Other health problems can include the following:

Not every person develops every complication^3,6. The care team can select monitoring based on current needs.

Doctors have often grouped progression into four stages^6,7. However, children might not experience the same symptoms at each stage⁷.

Stage one often begins between 6 and 18 months^6,7. Development slows, and eye contact, feeding, muscle tone, or crawling may change^6,7.

Stage two often occurs between ages one and four^6,7. Hand use, speech, coordination, and social contact may decline^6,7.

Stage three often begins between ages two and ten^6,7. Seizures remain common, while crying or communication may improve^6,7.

Stage four can start after stage three⁷. Walking and muscle strength may decline, while communication skills can remain⁷.

These stages are only a broad guide. Each person’s abilities, symptoms, and rate of change may differ^3,7.

Most classic Rett syndrome cases involve a harmful MECP2 gene change^1,4. Genes carry instructions that help the body’s cells work.

The MECP2 gene gives instructions for making the MeCP2 protein^3,4. This protein helps control gene activity and supports normal brain function^1,3,4.

MECP2 changes may reduce the protein or keep it from working well^3,4. This can disrupt how brain cells work and communicate⁴.

A pathogenic variant is a gene change known to cause disease. Such MECP2 variants occur in over 95% of people with typical Rett syndrome.

However, an MECP2 change does not always mean a person has Rett syndrome³. Doctors must also review development, symptoms, and examination findings^1,3.

The type and location of the gene change can affect the clinical pattern^1,3. Other genes and sex chromosome factors may also affect severity³.

Most MECP2 changes linked to Rett syndrome are de novo. De novo means the change arose on its own instead of coming from a parent.

More than 99% of affected people have no family history of Rett syndrome⁴. Inherited cases make up less than 1% of recorded cases³.

Rare families have more than one person with an MECP2 change^3,4. Testing may help identify relatives who carry a known family change³.

Families can consult a clinical geneticist about a diagnosis and genetic testing^3,5. A counselor can also help families discuss future testing choices.

The MECP2 gene is on the X chromosome^1,4. This pattern helps explain why the condition mainly affects females.

Some males develop MECP2-related severe neonatal encephalopathy⁴. This is a serious brain disorder that starts very early in life⁴.

Other males can have milder features linked to MECP2 changes⁴. These may include learning problems, seizures, and movement problems⁴.

CDKL5 deficiency disorder and FOXG1 syndrome can look similar to Rett syndrome^4,8. Experts now view them as separate disorders in most cases^4,8.

Diagnosis begins with a close review of growth and development^3,5. Doctors ask about milestones, lost skills, symptoms, and family history.

Rett syndrome remains a clinical diagnosis. This means the diagnosis depends on history, symptoms, and medical examinations^1,3.

Doctors look for regression and the four core features^2,5. These involve hand use, speech, walking, and repeated hand movements^2,5.

Slowed head growth may also lead doctors to consider this condition. Seizures and unusual breathing patterns can support the assessment.

Doctors must also assess other possible causes. Similar signs can occur with other gene, brain, metabolic, or developmental disorders.

Hearing and vision problems can also resemble parts of the condition. Testing helps the team identify the best explanation for the changes.

A blood test can look for pathogenic MECP2 variants^3,5. Finding one supports the diagnosis when the person’s clinical features also fit^1,3.

Genetic testing adds to the medical assessment but does not replace it^1,3. Not everyone with an MECP2 variant has the Rett syndrome pattern³.

A negative MECP2 result may lead to more evaluation. The team may assess other gene changes or health conditions.

A genetic counselor can explain the result and its limits. The counselor can also discuss inheritance and possible family testing^3,5.

Doctors select other tests based on the person’s signs and history. The assessment may include:

Several specialists may take part in the assessment. A pediatric neurologist focuses on brain and nerve conditions.

A developmental pediatrician may assess a child’s growth and skills. A clinical geneticist can review gene findings and related conditions³.

Families may also work with a genetic counselor. Other specialists can join the team as health needs change.

Treatment focuses on symptoms, health, comfort, movement, and communication^1,3,5. Needs often continue through childhood and adult life.

NINDS reports that the FDA approved trofinetide in 2023³. Its source states approval for children age two and older with Rett syndrome³.

The supplied sources do not confirm a separate adult indication. They also do not provide a full current safety profile.

A major review discusses symptom-management guidance and trofinetide treatment². Ask the prescribing team about current approval, expected benefits, and possible risks.

Antiseizure drugs may help control seizures^1,3. Other medicines may address stiffness, sleep, breathing patterns, gut problems, or heart issues.

Regular care may track the spine, heart, digestion, sleep, breathing, and nutrition^3,5. The team can adjust care as symptoms and skills change.

Physical therapy can support posture, balance, flexibility, walking, and movement. It may also help maintain a safe sitting position.

Walkers, wheelchairs, braces, casts, or splints may provide added support^3,5. Equipment choices should match the person’s mobility and comfort needs.

Occupational therapy supports daily tasks, including dressing and eating^3,5. It may also help preserve useful hand movements.

Speech-language therapy can teach ways to communicate without speech. These methods may also support social contact and daily participation.

Feeding plans can support growth and reduce choking or vomiting. Some people need high-calorie food or nutrition through a stomach tube.

Early help and school services can support learning and social participation. Special changes may make school, work, or group activities easier.

Families can ask schools about individual goals and communication tools. Shared plans can help teachers, therapists, and caregivers work together.

Daily care and poor sleep can place great stress on families. Caregivers can seek counseling, peer support, and other ways to ease stress.

Advocacy groups may help families find trusted information and support. MedlinePlus lists the National Organization for Rare Disorders as one resource⁴.

If development slows, a healthcare professional can assess the child's symptoms^3,5. When learned skills begin to fade, children may need extra help with everyday activities^3,5.

Changes in hand use, speech, eye contact, or movement can be signs of Rett syndrome^3,5. A doctor can check development and consider other possible causes.

A pediatric neurologist can help assess brain and nerve symptoms³. A developmental pediatrician or clinical geneticist may also help confirm the diagnosis³.

Keep regular follow-up visits after diagnosis. These visits help the team track health problems and update care plans.

Bring a list of recent changes to each visit. Also note changes in sleep, feeding, movement, or communication.

Learning about Rett syndrome signs, causes, diagnosis, and support can guide the next steps. Early assessment may connect families with testing, therapy, and specialist care.

Care should match each person’s health, skills, and daily needs^3,5. Medical care and therapy can support movement, communication, comfort, and social involvement^3,5.

School programs and family resources can provide added help. A skilled care team can help families build a practical long-term plan.