{"h1":"WHO-GMM vs the AbilityScore developmental assessment","faq":[{"a":"No. The WHO-GMM is a population reference showing the typical age range in which healthy children reach six gross-motor milestones. It helps you see whether progress is within a normal window, but it does not diagnose anything on its own.","q":"Is the WHO-GMM a diagnostic test?"},{"a":"Yes. The windows are deliberately wide because healthy children vary a great deal. Being at the late edge is common and often perfectly typical, but if a milestone is clearly delayed or progress stalls, a developmental check is sensible.","q":"Can my child be outside a WHO window and still be fine?"},{"a":"No — they complement each other. The WHO-GMM is a quick reassurance reference for gross motor only, while the AbilityScore® is a clinician-administered assessment across many developmental domains that builds your child's individual baseline and plan.","q":"Does the AbilityScore replace the WHO milestones?"},{"a":"It is administered and interpreted only by a qualified clinician at a Pinnacle Blooms Network centre, in the context of your child's full history. Any diagnosis is formed there, never from an online figure or a chart.","q":"Who carries out the AbilityScore assessment?"}],"lang":"en","slug":"how-does-the-who-gmm-compare-with-the-abilityscore-developmental-assessment","title":"How does the WHO-GMM compare with the AbilityScore developmental assessment?","entity":{"key":"who_gmm","kind":"instrument","name":"WHO Windows of Achievement for Gross Motor Milestones","slug":"who-gmm"},"lenses":[{"kind":"stakeholder","label":"Parent","value":"parent"},{"kind":"intent","label":"Assessment","value":"assessment"},{"kind":"lifecycle","label":"Measure","value":"measure"},{"kind":"route","label":"Screen","value":"screen"},{"kind":"empowerment","label":"Early Clarity","value":"early_clarity"}],"parent":{"key":"assessments","label":"Assessments"},"related":[{"lang":"en","slug":"at-what-age-is-the-who-gmm-developmental-assessment-used-for-a-child","title":"At What Age Is the WHO-GMM Used for a Child?"},{"lang":"en","slug":"how-does-abilityscore-track-progress-in-a-child-with-gross-motor-delay","title":"How AbilityScore tracks progress in Gross Motor Delay"},{"lang":"en","slug":"should-my-child-have-a-who-gmm-assessment-and-what-does-it-involve","title":"Should My Child Have a WHO-GMM Assessment?"},{"lang":"en","slug":"when-is-the-who-gmm-indicated-and-what-are-its-strengths-and-limits-in-early-childhood","title":"When is the WHO-GMM indicated, and what are its strengths and limits?"},{"lang":"en","slug":"what-is-the-who-windows-of-achievement-for-gross-motor-milestones-who-gmm-and-what-does-it-assess","title":"What is the WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM)?"},{"lang":"en","slug":"how-does-the-gmfm-compare-with-the-abilityscore-developmental-assessment","title":"How the GMFM Compares with the AbilityScore Assessment"}],"summary":"The WHO-GMM and the AbilityScore® do different jobs. The WHO-GMM is a population reference showing the broad, normal age window for six gross-motor milestones like sitting and walking. The AbilityScore® is a clinician-administered, whole-child assessment used at a Pinnacle centre to build your child's individual baseline and plan — they complement each other rather than compete.","answer_md":"*You may have spotted the WHO's gentle milestone charts and wondered how they sit alongside Pinnacle's own assessment — let's clear that up.*\n\n## In short\nThe [WHO Windows of Achievement for Gross Motor Milestones](/who-gmm) and the AbilityScore® do two different jobs. The WHO-GMM is a research-based *population reference* — it tells you the broad age range in which healthy children worldwide tend to sit, stand and walk. The AbilityScore® is a clinician-administered, whole-child *assessment* used at a Pinnacle centre to build your child's individual baseline across many domains. One is a map; the other is a personal compass.\n\n## How the two compare\nThink of them as complementary, not competing:\n\n- **What they measure.** The WHO-GMM covers six gross-motor milestones only (such as sitting without support, standing and walking alone). The AbilityScore® is broader — it considers communication, social-emotional, cognitive, motor and adaptive skills together.\n- **What they're for.** The WHO-GMM gives a normal *window* — for example, walking alone typically emerges across a wide span of months, not a single deadline. It's a reassurance and screening reference. The AbilityScore® turns observation into a structured, individual picture you can track and act on.\n- **How they're used.** The WHO-GMM is a chart anyone can read; the AbilityScore® is administered by a qualified Pinnacle clinician who interprets findings in the context of your child's full history.\n- **What you get.** The WHO-GMM answers \"is this within the typical range?\" The AbilityScore® answers \"what is my child's own baseline, and what's the plan?\"\n\nA child can fall outside a WHO window and still be perfectly fine — windows are wide for a reason. But a milestone that arrives late, or a pattern that feels off to you, is a good reason to move from the chart to a proper look.\n\n## When to seek a closer look\nIf your child is at the far end of a WHO window — for instance not sitting with support by around 9 months or not walking by around 18 months — or if motor progress seems to stall or regress, it's worth a developmental check rather than waiting. Trust your instinct; you know your child best.\n\n## The Pinnacle way\nDevelopmental measurement supports care planning; diagnosis requires an appropriately qualified healthcare professional., under the care of a qualified clinician — never from a chart or an online figure. The AbilityScore® is a clinician-administered structured assessment that measures your child against *their own* baseline across many domains, then guides a practical plan. Backed by 2.5 billion+ data points, 25 million+ therapy sessions and 700+ therapists across 70+ centres, our teams pair assessment with hands-on support such as [occupational therapy](https://www.pinnacleblooms.org/best-occupational-therapy-center-india-proven-improvement-rate) when gross-motor skills need a gentle boost. Learn how the measure works: [what the AbilityScore is and how it's calculated](/ask/what-is-the-abilityscore-and-how-is-it-calculated).\n\n## Trusted sources\nWHO Multicentre Growth Reference Study on windows of achievement for six gross motor milestones; WHO and Nurturing Care framework on early childhood development; CDC and HealthyChildren (AAP) developmental milestone guidance.\n\n**Next step —** Move from a chart to a clear, personal picture. [Book an AbilityScore assessment](https://www.pinnacleblooms.org/enroll-autism-speech-aba-therapies-india) with a Pinnacle clinician for warm, practical next steps.\n\nThis is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.","canonical":"https://pinnacleblooms.org/ask/how-does-the-who-gmm-compare-with-the-abilityscore-developmental-assessment","editorial":{"reviewed_at":"2026-06-11T20:12:18.613642+00:00","reviewed_by":null,"developed_by":"SETU Consortium · Pinnacle Blooms Network"},"alternates":[{"href":"https://pinnacleblooms.org/ask/how-does-the-who-gmm-compare-with-the-abilityscore-developmental-assessment","lang":"en","indexable":true}],"dimensions":[{"key":"assessments","label":"Assessments"}],"meta_title":"WHO-GMM vs AbilityScore: How They Compare","meta_robots":"index, follow, max-image-preview:large","everyday_tip":"Use the WHO windows as reassurance, not a deadline — they are deliberately wide. Give your baby plenty of supervised floor and tummy time each day so they can practise rolling, sitting and pulling to stand at their own pace.","published_at":"2026-06-10T12:36:00.194892+00:00","reading_paths":[{"key":"understand","items":[{"lang":"en","slug":"what-is-the-who-windows-of-achievement-for-gross-motor-milestones-who-gmm-and-what-does-it-assess","title":"What is the WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM)?","reason":"Linked from this answer"},{"lang":"en","slug":"at-what-age-is-the-who-gmm-developmental-assessment-used-for-a-child","title":"At What Age Is the WHO-GMM Used for a Child?","reason":"Linked from this answer"}],"label":"Understand the subject","total":2},{"key":"assess","items":[{"lang":"en","slug":"should-my-child-have-a-who-gmm-assessment-and-what-does-it-involve","title":"Should My Child Have a WHO-GMM Assessment?","reason":"Linked from this answer"},{"lang":"en","slug":"when-is-the-who-gmm-indicated-and-what-are-its-strengths-and-limits-in-early-childhood","title":"When is the WHO-GMM indicated, and what are its strengths and limits?","reason":"Linked from this answer"},{"lang":"en","slug":"how-does-abilityscore-track-progress-in-a-child-with-gross-motor-delay","title":"How AbilityScore tracks progress in Gross Motor Delay","reason":"Linked from this answer"},{"lang":"en","slug":"how-does-the-gmfm-compare-with-the-abilityscore-developmental-assessment","title":"How the GMFM Compares with the AbilityScore Assessment","reason":"Linked from this answer"}],"label":"Understand assessment","total":4}],"what_to_watch":"Seek a developmental check if your child is at the far end of a WHO window — for example not sitting with support by around 9 months or not walking alone by around 18 months — or if motor progress stalls or appears to regress.","authority_links":[{"url":"https://www.who.int/tools/child-growth-standards","label":"WHO child growth standards and motor milestone windows"},{"url":"https://www.cdc.gov/child-development","label":"CDC developmental milestone guidance"},{"url":"https://www.healthychildren.org","label":"HealthyChildren (AAP) on developmental milestones"},{"url":"https://nurturing-care.org","label":"Nurturing Care framework for early childhood development"}],"last_reviewed_at":"2026-06-10T12:36:00.194892+00:00","meta_description":"The WHO-GMM is a population reference for gross-motor milestone windows; the AbilityScore® is a clinician-led, whole-child assessment. See how they compare","related_materials":[],"related_techniques":[]}