Hi my DS is born on the 23rd Dec :-) He wasn't due ntil mid-late Jan but nature will take it's course.
Our experience - I wouldn't recommend it if you have a choice. We hold his birthday party in September because by December everyone is going on holidays, school is finishing etc. We don't put the tree up until christmas eve because it's the only way to seperate the present fest. A lot of people try and buy him "a combined" present which we discourage - at 6 you would rather 2 cheap presents than one expensive one - this may change as he gets older. And the biggest fact our son pointed out to us this year. He has to wait 362 days to get another present.
Having said that when I was giving birth to him it never entered my mind and after 6 years we wouldn't have it any other way
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