because of Kurt's psychological problems, he found a form of therapy called 'age regression' where he acts like a baby and becomes non-verbal...

the moment you found out what he was doing you decided to become his caregiver while he regresses... At the moment he just came out of a performance and is now backstage, sitting on the couch while swinging his leg up and down and shows that he wants to regress...

"Agh..." he groans softly and flinches