Early Signs of Rett Syndrome in a 1-Year-Old Girl

Every little girl grows at her own pace — and noticing a change early is one of the most loving things a parent can do.

In short

Rett Syndrome is a rare genetic neurodevelopmental condition that almost always affects girls, and in the first year signs are often subtle. The most telling early pattern is a slowing or stalling of development after a seemingly typical start — sometimes with a loss of skills already gained, slowing head growth, and reduced use of the hands. These observations are reasons for a prompt developmental and medical check, not a diagnosis you can make at home.

Early signs to gently watch for

In many girls the first months look unremarkable, and changes appear gradually between about 6 and 18 months. Around 12 months, a parent may notice:

Development slowing or pausing

• Milestones that were on track begin to slow, stall, or quietly slip backwards
• Less babbling, eye contact or social engagement than before
• Reduced interest in toys or in reaching and grasping

Hand use changing

• Less purposeful use of the hands than earlier
• Emerging repetitive hand movements — wringing, mouthing, squeezing or hand-to-hand patterns

Body and growth

• Head growth that slows compared with earlier months (your paediatrician tracks this on the growth chart)
• Low muscle tone — a "floppy" feel, or being slower to sit or bear weight
• Feeding or settling difficulties

Many of these signs overlap with other, far more common and often temporary developmental variations. One observation in isolation rarely means Rett Syndrome — it is the pattern of slowing or regression over time that matters most.

When to seek a check

Because Rett Syndrome can involve loss of previously gained skills, any regression — losing babble, social smiling, eye contact or hand use — deserves a prompt review with your paediatrician, who may arrange genetic testing (it is most often linked to changes in the MECP2 gene) and a developmental assessment. "Wait and see" is not the right approach when skills are slipping. Early support protects communication, movement and family confidence, whatever the eventual cause turns out to be.

The Pinnacle way

At [Pinnacle Blooms Network](/) we walk this path beside you — gently, and without rushing to labels. A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care, alongside your paediatrician's medical investigations; they are never decided by an online checklist. Where development needs support, our therapists tailor occupational therapy and communication-building care to your daughter's strengths. With 2.5 billion+ data points and 25 million+ therapy sessions behind our approach, you are never working from guesswork alone.

Trusted sources

Framed in line with the WHO ICD-11 classification (LD90.0 Rett syndrome), and developmental guidance from the American Academy of Pediatrics and the CDC's "Learn the Signs. Act Early." resources, which emphasise tracking milestones and acting promptly on any loss of skills.

Next step — if you've noticed your daughter's development slowing or skills slipping, book a gentle developmental check with our team on WhatsApp: +91 91001 81181, and speak with your paediatrician about a medical review.