Baby Jackson is the leader of the Ankle Biters, a group of evil babies who were able to speak using teeth stolen from older children, who he and the Ankle Biters only appears in Operation: D.I.A.P.E.R.. They were defeated by Numbuh 1's poor singing abilities. They were born in the Memorial Hospital, where Dr. Lincoln is employed.
Baby Jackson is an infant who has green eyes. He wears a yellow sweater, a red snow cap and also red mittens.