Unofficial First Phrase

On our walk to school today Lydia was being very squirmy. At one point she threw her body weight forward, more or less stopping in a parallel position to the street with her face pointing down. At which point she uttered the "words" "uh oh!"

She has of course said this phrase many times before and at completely inappropriate times. But this time felt different, she was reaching for the ground and was trying to look around my hip to the back. On a hunch I turned around to see what had sparked her attention and there it was, about 15 feet behind us, her pearly white mitten.