How common are stereotypic movements in normally developing children?
Stereotypic movements in children are common, in fact. While exact numbers are unknown, it has been suggested that common motor stereotypies (e.g., thumb sucking, body rocking, nail biting) may occur in as many as two-thirds of infants and half of children under age 15. Prevalence of complex motor stereotypies (e.g., hand flapping, arm waving) may be as high as 3 to 4% of U.S. preschool children.
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