Development of bimanual performance in a population of young children with unilateral or bilateral cerebral palsy

right and left arms, while a linear trend best fit both arms moving for the entire bout for the right and left arms. Conclusions/Significance: Our findings support that there is an observable developmental trajectory in full day arm movement activity across early infancy. In general, it appears that infants show “U”-shaped developmental trajectory for one arm only bouts and an inverted “U”-shaped developmental trajectory for both arms moving for some portion of the bout. This is the first step in creating norms; these data will allow us to measure variability within and between subjects. Additional next steps are to determine whether full-day arm movement patterns relate to development of reaching and to assess infants with or at risk for neurodevelopmental disorders.