Circus Baby is a Manipulative animatronic that sings and dances all day for the children. She counts all the children that is in the room. Once her programming counts only one child in the room, a big metallic claw from Circus baby's stomach latches onto the child, pulling them in and immediately killing them. Nobody except William Afton (her creator) knows about the big giant claw in her stomach. When possessed by Elizabeth, she will start acting more human.