Since I have bought Sarah the knee proctector, she is more brave and daring when crawling on the floor. Now, she has learned a new crawling style, the "cow crawl". She can lift up her body while crawling. She even can crawl very fast if I use something to lure her.
Sometimes she also wanted to show off her talent by performing some dangerous act, for eg: lift up her buttock and stretch her hands on the floor. Really pening and "heart attack" when seeing her like that!!