Sound Ideas, CHILDREN - CHILD, 6 YEARS OLD, LAUGHING, INTENSIVE, 6 VERSIONS, KID, DIGIFFECTS 03

This sound effect can be found on Human Sound Effects by Digiffects - Series I, which was made by Sound Ideas.

Clean, Full Length and Unedited Link to the Sound Effect
SourceAudio

Video Games
PC:
 * Five Nights at Freddy's 4 (A very low pitched and echoey version is used for Nightmare Fredbear's laugh.)