I'll take your crazy and raise you two.
I started writing letters to Philip when I was pregnant, all those little notes, complaints, funny things they say, little pieces of advice, "what your life is like now" type stuff. Some hand written, some on computer. I still write them, and intend to write them til he is 18 or 21 or something, then Ill give them to him when he reaches that point.
I've done the same with Henry, and George already has his first letter too.