Instead of covering our faces to play peek-a-boo with Sophie, we had always just thrown a blanket over her head and asked her where she was. A couple of weeks ago, I was sitting on the couch with her and she kept pulling her blanket up above her head, then she'd bring it down again and look at us. It took a few times for me to realize she was trying to play peek-a-boo. Once we started reacting, she did it faster and started to giggle. She's done it several time since then. I finally got it on film this morning when she was going down for a nap.