In Baby Even's classroom, Baby Even tells Lily and Kid that come to the canteen for lunch but they saw Diaper Nugget is wearing his own baby diaper & he runs to Baby Even to hug him tighter behind so Kid & Lily are shocked

Diaper Nugget : coos, babble and baby laugh then sucks his own thumb in his own mouth

Lily : Why is he wearing a diaper

Kid : I-I don't know