Christmas Baby?

Liz
Quick question ladies...we're due January 8th 2016...but am I right in thinking that it would be considered perfectly normal to be two weeks either side of that date? Which would be 25th December 2015 - 22nd January 2016? Meaning that there's a window of a month when I could deliver in the 'normal' time frame? Anything before 25th Dec would be considered premature? 
​Thank you! :)