 The investigators are conducting a randomized trial of CIMT in children with CP using a wait-list control group. This design allows every child with CP to eventually receive the treatment and avoids issues of equipoise. The RCT portion of the study extends only for a 7-month period, from baseline to 6 months after the 1-month CIMT ends. For CP wait-listed controls, the study continues for 6 months following the CMIT intervention, separate from the completed RCT. We will reference data from both groups to a cohort of typically developing TD children to determine developmental trajectories. 