"Mom, really it is OK. A day later isn't a big deal."
"Oh by the way, would you feel less guilty about pushing my special day out one day if you spent a lot of money on a gift?"
Yep, that was about how it went. This morning he is back to feeling bad for me. Then he whispers to me that I should get a bey blade arena for my birthday so we can play with the bey blades together. I did point out that now he is 10 he is going with Daddy for five weeks.