Are girls more likely to have Intellectual Disability?

Many parents quietly wonder whether being a girl or a boy changes the odds — here's what the evidence actually shows.

In short

No — girls are not more likely to have intellectual disability. Across large population studies, intellectual disability is slightly more common in boys than girls, partly because of specific X-linked genetic conditions such as Fragile X that affect boys more often. The difference is modest, and what matters far more for any individual child is their own pattern of development, not their sex. Intellectual disability is recognised by how a child is learning, communicating and managing everyday skills — best understood through observation over time, never a single moment.

What the science says

Intellectual development disorders (ICD-11 code 6A00) describe significant limitations in both intellectual functioning (reasoning, learning, problem-solving) and adaptive behaviour (everyday practical, social and conceptual skills) that begin during the developmental period. Population data consistently show a small male predominance — often cited around a ratio of roughly 1.3–1.5 boys to every girl — largely driven by sex-linked genetic causes.

Importantly, some research suggests girls may be under-identified, because subtler presentations can be missed. So a lower diagnosed rate in girls does not mean girls are immune — it means every child, of any sex, deserves attention when development looks different.

When to look closer

For any child — girl or boy — gently note if they are persistently behind same-age peers in talking, understanding, playing, or managing daily tasks like feeding or dressing. Persistent parental concern is itself a reason to check, regardless of sex. A developmental review is the right, unalarming next step.

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 form or a child's sex alone. With 2.5 billion+ data points and 4.95 lakh+ families served across 70+ centres, our clinicians build a clear, strengths-first picture of where your child stands today and what support helps most. Explore our developmental therapy programmes and how a structured developmental check gives your family clarity.

Trusted sources

WHO ICD-11 (6A00, Disorders of intellectual development); CDC Learn the Signs, Act Early; Indian Academy of Pediatrics; American Academy of Pediatrics (HealthyChildren.org).

Next step — Curious where your child stands? A Pinnacle clinician can establish it.

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