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Transitions between crawling styles are smooth. Phasing between homologous and ipsilateral limb pairs remains similar despite variations in the use of the limbs over a crawling sequence. Each line represents one crawling sequence; data from two infants are shown. One infant (solid line) switched between hands-and-feet crawling (downward triangles) and a step-crawl mix (upward triangles). The other (broken line) switched between step-crawl mix and standard crawling (circles).
