[Purpose] The purpose of this longitudinal study was to investigate the diversity ininfant crawling and examine the quantitative regularity in crawling variations necessaryfor the acquisition of walking in infants with typical development. [Participants andMethods] Infants with no neurological or orthopedic problems participated in this study.Using Internet Protocol (IP) cameras, crawling was simultaneously filmed from sixdifferent angles. Filming was continued until the acquisition of independent walking. Thecrawling movement in the video was coded. We considered the number of different completedcodes as the number of variations and examined the cumulative number during the filmingperiod in each participant. [Results] Nineteen infants completed the study. The pattern ofchange in the cumulative number of variations with increasing age (in days) varied betweencases. Although the cumulative number of crawling variations at the time of acquisition ofindependent walking was inconsistent, it was negatively correlated with the crawling startage (in days). [Conclusion] Diversity exists in infant crawling. Infants who startcrawling at a younger age tend to express more variation, whereas infants who startcrawling when older tend to express less variation.
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