Bubble Baby Yoshi

Bubble Baby Yoshi is a blue-colored Baby Yoshi appearing in New Super Mario Bros. U. It can blow out bubbles if the player presses the button on the Wii Remote or the  button on the Wii U GamePad. These bubbles are able to instantly defeat most enemies and turn them into three coins each which the player can collect. Players also have the ability to bounce on the bubbles to reach higher places.

Bubble Baby Yoshis, similar to Balloon Baby Yoshis, can be seen on the world map, in Frosted Glacier, though it's not known the reason. A Blue Baby Yoshi appears in a challenge in Challenge Mode, where Mini Mario must use his bubbles to reach the top of the stage. Also, they are found in some Toad Houses alongside other Baby Yoshis.