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Who Gmm
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At What Age Is the WHO-GMM Used for a Child?
The WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM) is used for infants and young children, roughly from 4 months to about 24 months of age. It maps the typical age window in which most healthy children reach six key gross-motor milestones — sitting, crawling, standing and walking. Each milestone has a window rather than a single deadline, allowing for normal variation, and it serves as a reference to notice when a milestone falls outside its expected range.
Read the answer AnswerWhat is the WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM)?
The WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM) is a World Health Organization reference describing the typical age ranges in which healthy children worldwide reach six big-movement milestones: sitting without support, standing with assistance, hands-and-knees crawling, walking with assistance, standing alone and walking alone. It assesses when, not how well, these skills appear by giving a normal window of months for each rather than a fixed deadline, reflecting healthy variation. It is a population reference for understanding typical development, not a diagnostic test for an individual child.
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How does the WHO-GMM compare with the AbilityScore developmental assessment?
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.
Read the answer AnswerShould My Child Have a WHO-GMM Assessment?
The WHO Windows of Achievement for Gross Motor Milestones (WHO-GMM) is a reference framework describing the wide, normal age ranges for six motor milestones — sitting, crawling, standing and walking — not a stand-alone test. Most children don't need a separate WHO-GMM assessment; clinicians use the windows as one lens within a fuller developmental check. It's most useful when there is a specific concern, such as a child clearly past a window or losing a skill, in which case a proper review is wise.
Read the answer AnswerWhen is the WHO-GMM indicated, and what are its strengths and limits?
The WHO-GMM gives clinicians a percentile-based normative window for six gross-motor milestones in healthy children aged ~4–24 months. Its strength is acknowledging biological variability and reducing over-referral; its limit is a single-domain focus that misses tone, movement quality, asymmetry and non-motor domains. Use it as a screen and triage cue, not as a diagnostic or progress-monitoring instrument.
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