Belly Button

I don't ever want to forget that since Deakan was about one year old he has used his belly button as his comfort to fall asleep. Whenever he is tired he rubs his belly button. I put him in a onesie today and on our way home from the park he was super tired and unsnapped his onesie so that he could rub his belly button and fall asleep. Sometimes he does it when he's hurt or sad too. I wonder if he'll ever grow out of this habit? I sure hope not, it is such a unique little habit.