Little: *humming a song while playing with toys*
Caregiver: *starts listening more carefully*
Little: *starts singing a few words*
Caregiver: *looks at little fondly*
Little: *starts singing quietly, completely oblivious to caregiver*
Caregiver: *stares at little with such pride and happiness*
Little: *looks up, sees caregiver staring, stops singing and blushes*