Baby Jackson is a small, cute baby with green eyes. He is the leader of the Ankle Biters, a group of evil babies who were able to speak using teeth stolen from older children. They were defeated by Numbuh 1's poor singing abilities. They were born in the Memorial Hospital where Dr. Lincoln is employed. In Operation F.I.G.H.T, Numbuh 3 changing Baby Jackson's diaper.
- He has a green eyes, yellow sweater, pants, red mittens and red snow hat. He wears bowler hat sometimes.
- He resembling a Stewie Griffin from Family Guy.