Early Signs of Rett Syndrome in a 6–9-Month-Old

When a baby who was reaching her milestones beautifully begins to pause or slow, a parent's careful watching is a gift — and worth sharing early with someone who can help.

In short

Rett Syndrome is a rare genetic neurodevelopmental condition that most often affects girls, and very early signs can be subtle. Between 6 and 9 months, many babies appear to be developing typically, so there may be little to see — but gentle clues can include a slowing of progress, reduced eye contact or social engagement, lower muscle tone (a "floppy" feel), less reaching for toys, and the very early emergence of repeated hand movements. These are signals to share with a clinician, not a diagnosis — and early developmental review opens the door to support.

Gentle signs to notice at 6–9 months

Movement and tone

• A "floppy" or low-tone feel when held, or less strength in holding her head and trunk
• Slowing or pausing in motor milestones — sitting, reaching or rolling not progressing as expected
• Less reaching for or grasping of toys than before

Hands and behaviour

• Early hand movements that look repetitive — wringing, mouthing or rubbing — or reduced purposeful use of the hands
• Less interest in exploring objects with the hands

Connection and growth

• Reduced eye contact, social smiling or back-and-forth engagement
• Head growth that begins to slow over successive check-ups (deceleration of head circumference)
• A general sense that progress has plateaued after an earlier healthy start

Why a prompt check matters

Rett Syndrome is uncommon, and at 6–9 months its signs are often quiet — a slowing rather than a dramatic change. Many of these signals overlap with ordinary variation in development, which is exactly why a clinician's eye matters: they can track head growth, tone and milestones over time and arrange the right investigations. Because Rett has a genetic basis (most commonly linked to the MECP2 gene), confirmation involves medical and genetic assessment, not a checklist. Sharing your observations early is careful, reassuring practice — and the sooner gentle support begins, the better.

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 or a worried evening of searching. Our team looks at the whole baby across movement, hand use, communication and growth, and works alongside your paediatrician for any medical or genetic referral. Learn more about Rett Syndrome and how early occupational therapy can nurture your child's hand use, play and connection.

Trusted sources

Guided by WHO developmental and Nurturing Care guidance, the American Academy of Pediatrics and HealthyChildren.org on developmental monitoring and loss or slowing of skills, and the WHO ICD-11 classification of Rett Syndrome — all paraphrased here for parents.

Next step — book a prompt, reassuring developmental check with our team on WhatsApp: +91 91001 81181, and let's understand your baby together.