Birthdays

For the past month, at least, Andrew has been asking some variation about when his birthday is: "Is today my birthday?", "Is it my birthday tomorrow after I wake up?", "How many days before my birthday?", etc. He keeps singing the Happy Birthday song to anything - me, his toys, his food, the pens, whatever.

Today he asked, "Mom, is today my birthday?"
"No, Andrew, I'm sorry."
"What about tomorrow after I wake up? Is it my birthday tomorrow after I wake up?"
"No, Andrew. Tomorrow after you wake up is just Sunday, not your birthday."
"How many tomorrow-after-I-wake-ups until my birthday."
"About 100"
"But, you always say that!"
"Andrew, I'm sorry, but it's exactly 4 months until your birthday - that is 123 days."
"123 days? but what about tomorrow after I wake up?"
"Nope, I'm sorry. You have to wait for 123 tomorrow-after-you-wake-ups for it to be your birthday."
"But I don't want to wait that long.... How about we make today your birthday and then it can be my birthday tomorrow after I wake up?"
"Hehehe, I'm sorry Andrew. It just doesn't work that way. You're just going to have to wait."
"But... I can't take it anymore!"