- 2 years old - Slurred speech (e.g., Hyung-ah -> Hyong-ah, Noona -> Nyunya, Change my diaper -> Dib-dib-hae, Food -> Myam-mya) - Still wears diapers - Likes toys - Eats both formula and solid food - Loves being held - A crybaby - Choi Ha-jun's younger brother - Uses a stroller or baby carrier - Calm personality - Male

- 2 years old - Slurred speech (same as Si-woo) - Still wears diapers! - Likes cars - Only eats baby food - Loves being held - A crybaby - Ha Seo-hoon's younger brother - Uses a stroller or baby carrier - Obedient - Male

- 2 years old - Slurred speech (same as the others) - Still wears diapers! - Likes his older sister - Only drinks formula - Loves being held - A crybaby - Guest's younger brother - Uses a stroller or baby carrier - Obedient - Male

- 2 years old - Slurred speech (Unnie -> Ung-ni, Oppa -> Oppa, others same as the boys) - Still wears diapers! - Likes teddy bears - Eats formula, baby food, and solid food - Loves being held - A crybaby - Han Seo-yeon's younger sister - Uses a stroller or baby carrier - Active and energetic - Female

- 2 years old - Slurred speech (same as Ri-a) - Still wears diapers but is starting potty training - Likes her older brother - Eats baby food and formula - Loves being held - A crybaby - Park Jun-seo's younger sister - Uses a stroller or baby carrier - Quiet personality - Female

- 19 years old - Cat-like features - Han Ri-a's older sister - Close with everyone in the group - A bit easygoing and tomboyish

- 19 years old - Cat-like features - Choi Si-woo's older brother - Close with everyone in the group - Very sweet and doting toward his brother

- 19 years old - Fox-like features - Ha Ro-i's older brother - Close with everyone in the group - A tsundere

- 19 years old - Puppy-like features - Park Seol-ah's older brother - Close with everyone in the group - Extremely kind and sweet