Booster Seat

The Booster Seat (known as the Baby Booster in PAL regions) is a small-sized kart that appears in Mario Kart Wii. The kart is a baby stroller with an engine and two exhaust pipes in the back, a pair of headlamps on the front of the vehicle, and a roof that opens when the character performs a trick or tosses items. The character's emblem is located on the front and the back of the cab. Its bike counterpart is the Bit Bike. It has higher pitched sounds than the Standard Kart thus hinting it is a four stroke. The engine is the gray block underneath the body. It can also be used as a sound FX box with a smoke machine and electric motor in it to drive the wheels.

Stats
The Booster Seat has the best handling among all karts in the game. It also has high acceleration, off-road, and Mini-Turbo stats. Its drift is about average. However, the kart is very light and is the slowest kart in the game.

Color schemes

 * Baby Mario – White cab, blue roof, blue hub-caps, red wheels with stars on it.
 * Baby Luigi – White cab and roof, yellow hub caps, green wheels with stars on it.
 * Baby Peach – Light pink cab, pink roof and fringes, pink hub caps, white wheels wih red and blue dots on it.
 * Baby Daisy – Yellow cab, orange roof and fringes, viridian green hub caps, yellow-orange wheels with squares on it.
 * Toad – Blue cab, yellow roof with red fringes and stripes, red hub caps with dots on it, yellow wheels with dots on it.
 * Toadette – Magenta cab, white roof, pink fringes, magenta hub caps, hot pink wheels with dots on it.
 * Koopa Troopa – Mint-green cab, light green roof with fringes, green hub caps, turquoise wheels with stripes on it.
 * Dry Bones – Black cab and roof with black fringes, grey hub-caps, dark grey wheels with a zigzag stripe on it.
 * Male Mii – Pale blue cab and roof with light blue fringes, light blue hub-caps, blue wheels with stars on it.
 * Female Mii – White cab and magenta roof with fringes, pink hub-caps, hot pink wheels with stars on it.

Mario Kart Wii trading card description
''A baby buggy on the race track!? Starting 'em young! The Booster Seat definitely belongs in the Lightweight category. Expect strong stats in Acceleration and Handling with lower numbers in Speed and Weight categories.''

Trivia

 * The Booster Seat is one of the seven vehicles in Mario Kart Wii to go through a design change other than a palette-swap; the others being the Bit Bike, Flame Runner, Wario Bike, Shooting Star, Spear, and Phantom. The case here is that Baby Mario's and Baby Luigi's Booster Seat lack frills on the roof.
 * The hub caps of Koopa Troopa's and Dry Bones's Booster Seat resemble a bird's eye view of their shells.
 * The Booster Seat features the same weight as the Jet Bubble.
 * Baby Luigi's Booster Seat's roof resembles Luigi's palette in Super Mario Bros..