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(A) Borderline drop-offs at the limit of infants’ crawling and walking ability for 12-month-old crawlers, 12-month-old walkers, and 18-month-old walkers. Each symbol represents one infant; solid lines represent group means. (B) Relations between posture-specific locomotor experience (months since crawling onset for crawlers, months since walking onset for walkers) and individual differences in borderline drop-offs, at the limit of infants’ abilities.
