The short answer is, not as high as in other months. Still, the possibility is there. In fact, if you look at the seasonally adjusted birth rates by month, your chances in December are just as good as having a baby in March or May. The lowest rate is April (13.7 live births per 1,000 population), compared with the highest rate in August (14.6). December comes in at 14.2 births per 1,000 population.
But this year, Christmas is on a Friday. How does that figure in? Well, the average number of births in 2006 (most recent data available) ranges from 7,587 live births on Sundays compared with 13,482 on Wednesdays. Fridays come in at a respectable 13,151, although Tuesdays and Thursdays, along with Wednesdays, have a higher average.
But then, that baby will come when it comes, right?
See the tables below for more detail: