Where is it?

So, last night Jon was lying on his stomach on the floor and JL walked up and pulled his shirt up exposing a few inches of his back. He looked at his dad's lower back, pointed to it and replaced the shirt. Then he did it again and this time he shook his head as he looked at his back. We were starting to get curious about what he was doing, as he repeated his actions a few more times and added his "where is it?" sign with his shoulders shrugged and hands raised. We had no clue what he was looking for (he must have done this about 8 times). Finally he walked over to me and lifted the bottom of my shirt and it dawned on us... he was looking for Jon's belly button! Well, Jon rolled over onto his back and JL was relieved to find his dad's missing belly button. :)