Baby (ベビー Bebī) is the last survivor of the Tuffle race who is rebuilt by his creation, Dr. Myuu as a Machine Mutant to exterminate the Saiyans and restore his kind by controlling everyone on Earth. He is the main antagonist of the Baby Saga in Dragon Ball GT.

Baby goes through radical changes as he evolves over time from his larval state. Looking part organic and part machine, Baby is initially a diminutive being with a grey outer layer and large red eyes with a long and wide, antenna that slopes off to one side. Upon reaching adolescence, he forms a bodysuit, with greenish tint as well as blue for most of his body and arms and now sports shoulder pads and wrist bands of red and yellow. His eyes also change color from red to blue.