For us, we keep his birthday and Christmas very separate, even though there is only a day difference.
He knows that Christmas is the day after his birthday.
This is the first year we are having a "real" party (on the 23rd) with friends and family. His 1st, 2nd and 3rd birthdays we had a little family party with a morning or afternoon tea, and a cake.
We don't buy him much in the scheme of things. He has usually gotten one "big" present for his birthday eg. a wooden ride on truck, wooden Thomas the Tank engine sets, and this year a bike, and then on Christmas he gets a few smaller things.
So far we haven't really had any "combining". The people in our lives tend to acknowledge his birthday and Christmas separately. Which is great!
I haven't really found it stressful so far. Although this year having a real party is making it a bit more of a full on time of year!
Similar to you, in our defence, HE was a week overdue, so it wouldn't have been "as bad" if he was born on December 17th, or earlier
Anyway, hope you feel more at ease about it. As you say, he doesn't mind about it and just wants his cake and ribbon. Oscar is the same - as long as their is cake, it's a birthday
ETA. This party, we invited quite a few people thinking there would be a fair few unavailable due to how close it is to Christmas, but all but two families have RSVPed yes!! A wonderful surprise!
This post has been edited by Jekaho: 17/12/2012, 08:43 PM