At 5 months and 3 weeks....

She rolled over!  We were playing on her playmate, and she finally rolled over from her tummy to her back.  I just recently googled how to encourage a baby to roll over, since she was taking her sweet time with it.  I had her on her belly and put a toy just out of her reach.  I noticed that she puts her arms out pretty wide while she holds herself up.  I repositioned her hands so they were closer together, and over she went! Hopefully she'll continue this new skill :)