Botulinum toxin has been shown to have beneficial effects on UE function while the muscles injected remain weakened by the toxin. Clinicians have theorized that improvements in UE function are maintained after the toxin wears off, but this has not been proven. Children randomized to the Botulinum toxin injection group will receive 3 injections. Their function will be tested before the first injection, while the paralytic results of the second injection are still in effect, and after the paralytic effects of the third injection have worn off, and the results compared in order to determine if functional improvements outlast the medicinal effects.