The Baby Booster (known as Booster Seat in US) is kart used by small characters and the kart is a baby stroller. Unlike most other karts when you choose Baby Mario or Baby Luigi the kart design changes, like other karts each character has their own color schemes. This kart is the slowest in the game but it’s handling and acceleration make up for it, the character who is driving the kart his their emblem on the front of it.
| Speed | Weight | Acceleration | Handling | Drift | Off-road | Mini-Turbo | Drift Type |
| 27/80 | 27/80 | 56/80 | 64/80 | 37/80 | 54/80 | 59/80 | Out |
