ADHD vs Rett Syndrome in Young Children

Both can affect a young child's attention and behaviour — but one is a difference in focus and energy, and the other is a rare genetic condition that changes how a child grows.

In short

ADHD (Attention-Deficit/Hyperactivity Disorder) and Rett syndrome are very different. ADHD is a neurodevelopmental difference in attention, impulse control and activity level — a bright, busy child who finds it hard to sit still or focus, but who keeps and builds their skills over time. Rett syndrome is a rare genetic condition (almost always in girls) where a child develops typically for a while, then loses skills she once had — especially purposeful hand use and spoken words — often with characteristic repetitive hand movements. The clearest signpost: ADHD does not take skills away; Rett syndrome involves a noticeable regression.

How they differ in everyday life

With ADHD, you may see a child who is constantly on the move, blurts out answers, struggles to wait or finish tasks, and is easily distracted — yet is learning, talking, playing and growing across all areas. The challenge is regulation of attention and energy, not loss of ability.

With Rett syndrome, the early picture is usually a baby who seemed to be developing well. Then, typically between 6 and 18 months, there is a slowing or loss of skills: a little girl who used to babble or use her hands may stop, and begin showing repetitive hand movements such as wringing, washing or mouthing. Head growth may slow, and walking and coordination can be affected. It is caused by a change in a single gene (most often MECP2) and is confirmed by genetic testing — it is not something a child grows out of or develops from parenting.

Because Rett syndrome involves regression and physical changes, it needs prompt medical and genetic assessment, whereas ADHD is identified through careful behavioural observation over time, usually once a child is a little older.

When to seek help

Any loss of skills your child once had — hand use, words, social smiles — is a reason to see a paediatrician promptly, not to wait and watch. For a young, energetic child who is learning well but very active and distractible, share your observations at a routine developmental check; attention patterns become clearer with age.

The Pinnacle way

This is general information, not a diagnosis — a clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care, never from an app or form. Our clinicians look closely at how your child attends, moves, communicates and uses her hands, and coordinate medical referral where a genetic condition is suspected — drawing on occupational therapy and tailored support. Learn more about ADHD and our wider [services](/).

Trusted sources

The World Health Organization's ICD-11 framework for neurodevelopmental conditions; the American Academy of Pediatrics and HealthyChildren guidance on attention concerns and developmental monitoring; CDC information on developmental milestones and acting early on any loss of skills.

Next step — If your child has lost any skill she once had, see a paediatrician promptly; for attention and activity concerns, book a developmental screening and let a clinician guide you.