Dose-response Study of Efficacy and Safety of Botulinum Toxin Type A to Treat Spasticity of the Leg(s) in Cerebral Palsy

Inclusion Criteria: * Female or male subject of 2 to 17 years of age (inclusive). * Uni- or bilateral cerebral palsy with clinical need for uni- or bilateral LL injections with BoNT for the treatment of spasticity. * Ashworth Scale \[AS\] score ≥2 in plantar flexors (at least unilaterally). * Clinical need for a total dose of 16 U/kg BW NT 201 (maximum of 400 U) for the treatment of LL spasticity according to the clinical judgment of the investigator. Exclusion Criteria: * Fixed contracture defined as severe restriction of the range of joint movement on passive stretch or predominant forms of muscle hypertonia other than spasticity (e.g., dystonia) in the target limb(s). * Surgery on pes equinus on side(s) intended to be treated with BoNT injections in this study within 12 months prior to Screening Visit (V1), in the screening period or planned for the time of participation in this study. * Hip flexion requiring BoNT injection.