How I know my three-year-old has a solid sense of self in 100 or fewer words:
Each girl is entirely dolled up. Reese prances in her leotard, pink tights, and ballet shoes. Kerrington wears a tutu over her everyday clothes, repeatedly spinning in a circle until she falls to the floor from dizziness. Brooke wears a bedazzled play dress, pulls high satiny gloves to her elbows, and places a jeweled crown on her head.
A visitor arrives at the door and spots Brooke. "Why, hello little princess!"
"Hello, but I am not a princess." she corrects him. "I am a mosquito." She pauses for just a moment before clinching it. "Look out. I sting."