The Hand That Rocks the Cradle(1992)

Trust is her weapon. Innocence her opportunity. Revenge her only desire.

A suburban family chooses seemingly sweet Peyton Flanders as their newborn's nanny. Only much later does the infant's mother, Claire Bartel, realize Peyton's true intentions -- to destroy Claire and replace her in the family. The nail-biting suspense builds quickly in this chilling psychological thriller about deception and bitter revenge.