From Our Catalog:
The Exorcist (videorecording), 1973
Production Description: The Exorcist, Academy Award winning director William Friedkin's masterpiece of suspense, haunted, intrigued, and thrilled the world. When the movie was first released in 1973, viewers were blown away.
While not the first horror film to feature an evil or possessed child, Linda Blair's standout performance set the bar for all who would follow in her demented footsteps. In few other films (with the exception of Carrie) are the cultural anxieties surrounding an adolescent girl's coming of age so disturbingly apparent. The Exorcist truly shocked audiences of its time, and remains disturbing today (one particular scene involving a crucifix will never be erased from the minds of most viewers).
For a "where are they now" list of the most menacing children of horror, including Linda Blair, check out Screencrush's Creepy Kids of Horror