Rock-a-bye board book

For Sierra's birthday she got a small cradle that eventually she'll be able to use for dolls, stuffed animals etc. (Thank you, Pat!!) As of yet, she hasn't shown much interest in those sorts of toys, but her favorite thing on the planet is her board books. Yesterday I peeked into the living room where she was playing while I was working in the kitchen. She had put some of her books into the cradle and was rocking them, then taking them in and out and "reading" them (she always has this drony sort of hum that she makes when she is looking at her books). The next time I looked in, a few minutes later, she was doing the same thing, only she had dragged the cradle clear across the room!