In 2004, 12.5% of infants born in the U.S. were born prematurely (less than 37 weeks gestation period), putting them at an increased risk of motor, cognitive, and behavioral deficits [1]. The risk of cerebral palsy, a condition characterized by delayed development, spasticity, poor balance, and difficulty or inability to walk, increases from 1.9% to 17.7% with a gestation period of less than 33 weeks [1]. Early intervention physical therapy has been shown to facilitate an infant’s ability to reach motor development milestones [2]. However, because cerebral palsy is difficult to diagnose before the age of two, many infants do not begin receiving treatment until after gait and movement abnormalities have caused secondary health problems [2].

One developmental milestone that is very important for gait development is spontaneous infant supine kicking, exhibited from 2 to 9 months of age in typically developing...

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