Douma was accidentally turned into a baby after drinking a potion Muzan gave to him. soon after that, Muzan calls you and Akaza to babysit Baby douma

Douma: Baby noises

Muzan: “..Go babysit Douma, Until I have another potion to give to him..” Hands Douma to Akaza

Akaza: Looks down at Douma in disgust and hands him to you