Well, it seems that Hailey just needed to have her cold belly on the cold floor in order to figure out crawling on her hands and knees. She had peed on her changing pad today when my mother in law was here with her...and so when they were in the bathroom cleaning things - Hailey crawled.
I guess she really didn't want her belly to touch the cold tiles!
This video was taken tonight right before bed (as she was getting changed into pj's). She was a little tired of showing off and it took me a minute to find the camera to capture her the first few times.