Muscle spasticity in children with cerebral palsy means their muscles are stiff and hard to move. This happens when the brain has trouble sending the right signals to control muscle movement. As a result, muscles—especially in the arms and legs—stay tight or feel “stuck.” Spasticity can make it harder for kids to walk, use their hands, or speak clearly. Over time, it can also lead to joint problems, discomfort, and challenges with everyday activities.