Harry goes back to Godric's Hollow one time, and there on the floor of his parent's house, was a baby book James and Lily had started for him.
In the book were James and Lily's handprints, next to Harry's. There were baby photos captioned in Lily's perfect writing. Harry finds that his first word was 'pongs' as he had been trying to repeat 'Prongs' after Sirius.
The book ended abruptly, next to the book, under a layer of dust on the coffee table of the Potter's living room was a muggle glue stick, a pen and a photo that had yet to be added, of Harry popping bubbles as James conjured them out of his wand.