Not to Be Outdone

Harriet was laying on a towel on the floor for some "tummy time," as all good 21st century babies are supposed to. I was changing Win's diaper. When I returned to Harriet, there she was, laying on her back! I guess Win's 3-week-old rolling over wasn't good enough for her. The question we'll have to answer is whether or not this is a skill or a one off thing.