The Baby Tyrannosaurus rex or Baby T-rex is a small dinosaur which was first introduced in 2000 with the Dino Island line. The piece is a compliment to the regular original Tyrannosaurus Rex figure which also appeared the same year in the same LEGO set line. Originally appearing as green, the piece has since appeared in various other theme sets, in various colours. The piece connects to only one stud.
- Dark grey (stone)
- Metallic gold
- Pale blue
- 1 in 4079 Mini Rex
- 1 in 5975 T-Rex Transport
- 1 in 1349 LEGO Studios Steven Spielberg MovieMaker Set
- 1 in 5914 Sam Sinister and Baby T
- 1 in 5903 Johnny Thunder and Baby T
- 1 in 5955 All Terrain Trapper
- 1 in 1278 Johnny Thunder & Baby T
- 1 in 7783 The Batcave: The Penguin and Mr. Freeze's Invasion
- 1 in 1354 Dino Head Attack
- 1 in 5987 Dino Research Compound
- When turned upside down, this piece resembles a face, as seen in 7623 Temple Escape.
- Baby T-Rex appeared on one of the minifigure head in the "Think Tank" from The LEGO Movie.