We were looking at Emma's blog to see what she was doing at 5 months and found this post. It is from Emma's blog, but describes Ella at 5 months exactly...
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mmlla's new favorite game is flip me over! She is great now at rolling over back to tummy. It is one fluid movement rather than the 3 part maneuver it used to be and she wants to do it over and over. The problem is she cannot yet roll from tummy to back so she rolls to her tummy then fusses for us to flip her back then does it all over again and over and over. At least she does not roll over in her crib at night and want us to flip her back in the middle of the night.
Ella loves to roll over now. For a while I called her the rolling over ninja because she would only roll over as a stealth maneuver when no one was around to watch. We would sit on the floor with her and she would happily coo and roll to the side, but never all the way over. As soon as I ran to move clothes from the washer to dryer or taking something out of the over I would come back to a baby on her tummy. I guess she finally felt she had it down well enough to show off for us! She also LOVES to eat her hands and feet. So here is a video of her rolling over taking a break to eat her foot.