The purpose of this case study was to introduce botulinum toxin A injection in cerebral palsy. Spasticity can be managed using a variety of methods. Eliminating aggravating sources, promoting stretching and bracing, and positioning are the least invasive methods of treatment. Botulinum toxin A injection is a relatively recent method of spasticity management in children with cerebral palsy. A 3-year old boy was evaluated for possible botulinum toxin injection to promote left side function. The patient had left hemiparetic cerebral palsy. He walked with bilateral intoning, much worse on the left than on the right and with excessive plantar flexion on the left. Botulinum toxin A was injected into the left medial gastrocnemius, with the goals of improving quality of gait. Finally, botulinum toxin treatment of would improve the motor function and ambulatory status in cerebral palsy by hypertonicity, spasticity, dynamic contracture and athetoid movement.