Model of the course.
Baby Park is the third track of Mushroom Cup in Mario Kart: Double Dash!!, being in the shape of an oval-shaped loop. On one side, it's blue and on the other side it's red. This presumably represents the colors of Baby Mario and Baby Luigi. It is the shortest course by far and therefore has seven laps as an oppose to three.
Other tips
Learning to mini-boost and snake really helps here to put an advantage over your opponents.
Reappearance
The map of Baby Park as it appears in Mario Kart DS.
This course reappears in Mario Kart DS as a retro course, only it has five laps. It is one of the shortest courses, like it was in Mario Kart: Double Dash!!
In Mario Kart 8 the entire is in anti-gravity mode.