|Stage Name||Birth Name||Position||Birthday||Age||Height||Star Sign||C Y||BT Sort descending|
|Hayoon 하윤||Jung Hayoon||Sub-vocal||19||163 cm or 5'4"||Scorpio||Tiger||A|
|Dayoon 다윤||Ahn Dayoon||Sub-vocal||17||164 cm or 5'4½"||Scorpio||Dragon||A|
|Gaon 가온||Kim Gaon||Sub-vocal||17||163 cm or 5'4"||Pisces||Snake||A|
|Kongyoo 공유||Lee Kongyoo||Maknae||17||163 cm or 5'4"||Taurus||Snake||B|
|Moonhee 문희||Choi Moonhee||Leader, Visual||21||167 cm or 5'5½"||Taurus||Ox||AB|
|Chaehyun 채현||Park Chaehyun||Sub-vocal||18||163 cm or 5'4"||Libra||Hare||AB|
Bonus Baby 보너스베이비 is a six-member girl group formed by Maroo Entertainment in December of 2016. The group consists of members Moonhee, Hayoon, Chaehyun, Dayoon, Gaon, and Kongyoo. They made their debut on January 1, 2017, with the single "We."
At the time of the debut, they were the youngest girl group ever in Korea by average age. The group's eldest two members originate from an idol group of the same company, MyB, which disbanded in late 2016.