Unclear on The Concept

Me: Donny! Where's your nose?
Donovan: [hesitates, smiles, points to his mouth.]
Me: No, silly! Your nose! Where's your nose?
Donovan: [maintains eye contact, smiles wider, points to his mouth.]
Me: No, that's your mouth! This is your nose [moving his finger from his mouth and making him poke his own nose]! Nosenosenosenosenose! Now--where's your nose?
Donovan: [verrrrrry slowly lifts his finger and points...to his mouth. And laughs.]