It is widely known that walking ability declines during a period of growth spurt in patients with cerebral palsy (CP), even if walking becomes possible using an assistive device1). Infants with CP cannot achieve normal motor development, and the start of walking is often delayed2, 3). Gross motor function develops during the first decade of life and then plateaus1). The reasons for this plateau include changes in muscle balance due to body growth, deformation of the bones and joints, weight gain, and lack of walking opportunities. Various methods of rehabilitation have been performed to improve the walking ability of children with CP. However, as the characteristics of patients with CP depend on various factors, including the type and severity of disease and position J