Webthe guidance on this page has been clinically reviewed by choc pediatric experts. Learn the signs, symptoms and treatment for selective mutism in children,. Webselective mutism (sm) is an anxiety disorder in which a child is unable to speak in some settings and to some people because of anxiety. Children with sm often. Webtreatment for selective mutism (sm) can include psychotherapy and medication to address the anxiety that underlies the person’s inability to speak in certain situations. Problems with sound processing. A speech or language problem, such as stuttering. Family history of anxiety disorders. Webselective mutism (sm) is an anxiety disorder that affects children in school, where they find themselves unable to speak, though they speak comfortably at home.