Creepiest Movie Children - Rotten Tomatoes
Firestarter (1984)

Nobody writes creepy kids quite like Stephen King -- The Shining, Children of the Corn, and Pet Sematary have enough terrifying tots to keep social workers busy for years. In Firestarter, Charlie McGee is borne of a union between two people undergoing a secret government experiment. Result: a child who can ignite infernos via telekinesis. If the government doesn't get to her first, Charlie will have a bright future as an arsonist. Or as a pyrotechnic artist for heavy metal bands.