How to be Three:
Step 1. Look cute as button in every single picture... ever.
Step 2. Master the art of backyard swinging.
Step 3. Talk about either Frozen or your baby doll the entire time you're photographed.
I think she's nailing it so far. (Also, if you can look at all these images and not laugh out loud, please let me know because I'm over here cracking up.)