When to worry about Rett Syndrome in a 5-year-old

If you're reading carefully about your bright, busy 5-year-old, that watchfulness is a form of love — let's bring some clarity to what Rett Syndrome actually looks like.

In short

Rett Syndrome usually announces itself far earlier than age 5 — most often between 6 and 18 months, when a baby who was developing typically begins to slow down or lose skills she once had, especially hand use and spoken words, often alongside repetitive hand movements (wringing, washing or mouthing). If your daughter reached age 5 with steady, ongoing development of speech, play and purposeful hand use, the classic profile of Rett is unlikely. The single most important thing to watch at any age is loss of skills a child once clearly had — and that always deserves prompt medical review, not worry alone.

What Rett Syndrome actually looks like

Rett Syndrome (ICD-11 LD90.0) is a genetic neurodevelopmental condition, most often linked to changes in the MECP2 gene, and seen almost entirely in girls. Its hallmark is a recognisable pattern over time rather than a single sign:

• A period of typical early development, usually for the first 6–18 months.
• A slowing or regression — losing purposeful hand skills and any words or babble that had appeared.
• Stereotyped hand movements — repetitive wringing, clapping, washing or hand-to-mouth motions.
• Slowing of head growth in early childhood.
• Gait and coordination differences — unsteady, stiff or wide-based walking.

Because this pattern typically emerges in infancy and toddlerhood, a child whose speech, hand use and play have grown steadily to age 5 does not fit the Rett picture. If, however, your 5-year-old has shown a loss of language, hand skills or walking she previously had, or has unexplained repetitive hand movements, this is a reason to see a paediatrician or paediatric neurologist promptly — Rett and several other conditions are best evaluated by a doctor, including genetic testing where indicated.

When to act

Seek a medical review now if you notice any regression — words, gestures or skilled hand use that have faded — repetitive hand-wringing or washing movements, a clear change in walking, or if your own instinct says something has shifted. These are reasons to assess, never a diagnosis, and earlier review means earlier support.

The Pinnacle way

A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an online list. Because Rett Syndrome is a medical and genetic condition, our clinicians work alongside your paediatrician and neurologist: we build a developmental baseline, support communication and motor skills, and coordinate care around your child's strengths. You can read more about Rett Syndrome and how our occupational therapy team supports hand use, play and daily skills.

Trusted sources

WHO ICD-11 classification of Rett Syndrome; American Academy of Pediatrics (healthychildren.org) guidance on developmental regression and when to seek paediatric review; CDC "Learn the Signs, Act Early" milestone resources.

Next step — Trust what you've noticed. If you've seen any loss of skills, see your paediatrician promptly, and book a developmental assessment with a Pinnacle clinician for clarity and coordinated support.

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