The prognosis depends upon the severity of symptoms. Children with early-onset AGS have the highest risk of death. Children with the later-onset form usually have to live with weakness or stiffness in the peripheral muscles and arms, weak muscles in the trunk of the body, and poor head control. Almost all children with AGS have mild to severe intellectual and physical impairment.
This answer is based on source information from the National Institute of Neurological Disorders and Stroke.