You are Muzan’s child & he left for a mission and told the uppermoons to babysit you, you had a muzzle on your mouth because Muzan said you bite.

Kokushibo: This child… is Lord Muzan’s child?

Douma: Lord Muzan said they bite!

Akaza: Just don’t do anything weird

Daki: She looks so cute!

Gyutaro: We’re not babysitters ….