expectation for speaking, such as at school) 2) despite speaking in other situations, not speaking interferes with school or work, or with social communication, lasts at least 1 month (not limited to the first month of school). Also, the failure to speak is not due to a lack of knowledge, or discomfort with the spoken language or due to a communication disorder (e.g., stuttering), and it does not occur exclusively during the course of autism spectrum disorder, schizophrenia, or other psychotic disorder