Many children are shy and quiet at school. They eventually find a friend or two, begin to open up in class, and may even initiate conversations with a teacher or unfamiliar student. This is not your child. At school, your child freezes when asked a question, speaks in a whisper, or is completely silent. Yet at home, in the comfort of close family and friends, he or she has no problem rambling on about his or her day. This severe discrepancy in behavior may be caused by Selective Mutism (SM).