Best Age to Start Therapy for Rett Syndrome

With Rett syndrome, therapy is most powerful when it begins the moment concerns appear — and it remains worthwhile at every age your child reaches.

In short

The best time to start therapy for Rett syndrome is as early as the first signs of regression or developmental concern are noticed — often between 6 and 18 months, when many children show slowing or loss of skills. But there is no age at which it is "too late": because Rett syndrome involves changing needs across the lifespan, early, consistent therapy protects the skills your child has, supports communication and movement, and improves comfort and quality of life at every stage. The honest answer is simple — the best age is now, whatever your child's age today.

Why early — and lifelong — therapy matters

Rett syndrome typically follows a pattern: a period of apparently typical early development, then a stage of regression (often affecting hand use, communication and walking), followed by a long, more stable phase. Therapy is shaped around this journey:

• Early intervention (infancy–toddler) — gentle work to preserve hand function, support feeding and swallowing safety, encourage movement, and build early communication before and during the regression stage.
• Communication support — many children with Rett syndrome understand far more than they can show. Eye-gaze and alternative-communication strategies open a real channel to connect, often at any age.
• Physiotherapy & occupational therapy — to maintain mobility, protect against contractures and scoliosis-related issues, and support daily living and posture across the years.
• Lifelong, adaptive goals — as needs shift, therapy shifts too, focusing on comfort, participation and maintaining hard-won skills rather than a single "window" that closes.

The core message for families: starting earlier gives more skills to protect, but meaningful gains in communication, comfort and participation are possible whenever therapy begins.

When to seek a check

Seek a developmental review promptly if you notice loss or slowing of previously learned skills, reduced or repetitive hand movements (such as wringing or mouthing), loss of purposeful hand use, changes in walking or coordination, or slowing head growth. Rett syndrome is a medical condition that needs paediatric and genetic assessment alongside therapy — prompt medical referral comes first, with therapy built around that care.

The Pinnacle way

AbilityScore® is part of Pinnacle’s developmental assessment. Diagnosis, where needed, requires an appropriately qualified healthcare professional — never from an app or online form. From there your child receives a precise developmental and functional profile through our clinician-administered AbilityScore® assessment, and a plan that may combine speech and communication therapy with movement and daily-living support. Learn more about how we support children and families across every stage of the journey.

Trusted sources

WHO ICD-11 listing for Rett syndrome; American Academy of Pediatrics (HealthyChildren.org) guidance on developmental regression and early intervention; American Speech-Language-Hearing Association guidance on augmentative and alternative communication.

Next step — Whatever your child's age, the best moment to begin is now. Book an assessment with a Pinnacle clinician.

This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.