How common is selective mutism?

Selective mutism is considered a relatively rare childhood anxiety disorder, affecting approximately 1 in 140 children. It typically manifests in early childhood, often between the ages of 2 and 5, and is characterized by a child's inability to speak in certain social situations despite being able to communicate in others. The prevalence can vary by population and setting, but it is more commonly observed in children with social anxiety or other anxiety disorders. Early intervention and support can significantly improve outcomes for affected children.