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  #1  
Old 20 December 2009, 11:49 PM
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Ponder Dec. 20 most common birthday?

Comment: The number of babies born is about the same for each of the 365
days in a year. However December 20 has the largest number of birthdays.

This I was told about 30 years ago, is it true?
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  #2  
Old 21 December 2009, 12:08 AM
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Well, I have a close friend who turns 29 today, if that helps any.
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  #3  
Old 21 December 2009, 12:45 AM
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Okay that would put the date of conception at around March 1st - so what happens at that time of year that makes people stay in and create their own fun?
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  #4  
Old 21 December 2009, 12:53 AM
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Quote:
Originally Posted by Eddylizard View Post
Okay that would put the date of conception at around March 1st - so what happens at that time of year that makes people stay in and create their own fun?
The least common birthday of the year - Feb 29th. But that means there should only be an increase every four years... which means there should be fewer kids born on Dec 20 in years without a leap day...
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  #5  
Old 21 December 2009, 05:26 AM
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I also just returned from a friends birthday today (yesterday now i guess), and my Sis in law was born today at 12:03 am -- which would almost qualify.
I also dated a girl 20 years ago who was born on the 20th.. so there might be something to this.
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  #6  
Old 21 December 2009, 05:30 AM
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Quote:
Originally Posted by ganzfeld View Post
The least common birthday of the year - Feb 29th. But that means there should only be an increase every four years... which means there should be fewer kids born on Dec 20 in years without a leap day...
No, you see, Dec. 20 is the most common birthday because babies conceived on both Feb. 29 and Mar. 1 are born that day!
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  #7  
Old 21 December 2009, 05:50 AM
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A quick Google search indicates that a lot of people are under the impression that 10/5 is the most common birthday, and that babies born on this date are likely to be conceived on New Years Eve. However, given that pregnancies last however damn long they feel like it, I don't think that babies born on one particular date all have the same likely DOC.
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  #8  
Old 21 December 2009, 07:26 AM
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Well, I don't know anyone with Dec. 20th as a birthday, therefore we can safely call this rumour false. Now let's never speak of this again.
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  #9  
Old 21 December 2009, 10:25 AM
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Quote:
Originally Posted by Beejtronic View Post
Well, I don't know anyone with Dec. 20th as a birthday, therefore we can safely call this rumour false. Now let's never speak of this again.
Same here. I concur.

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  #10  
Old 21 December 2009, 01:47 PM
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Considering how many women I've heard of scheduling their C-section or inducement (weeks in advance), I wouldn't doubt this as being possibly true now, but 30 years ago?

Generally, it seems like now obstretricians want to be able to schedule working hours and vacations just like anyone else, and women want to know what date is the latest they'll have to wait to give birth (and want to be certain to have the doctor they are familiar with). December 20th would seem like a good last day for scheduling any woman who was due to give birth sometime over the Christmas and New Year holidays.
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  #11  
Old 21 December 2009, 05:45 PM
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My sister was born on the 20th long before scheduled C sections. Counting back I get April. Nothing comes to mind.

On the other hand, I was born almost exactly 9 months after Valentine's Day.
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Old 21 December 2009, 08:52 PM
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My grandma and my friend are both born on the 20th. Though I don't see what makes that day popular, or if it even is.
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  #13  
Old 21 December 2009, 10:54 PM
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When I was in grade school it seemed like a disproportionate number of us had birthdays in October.
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  #14  
Old 21 December 2009, 10:58 PM
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Quote:
Originally Posted by Latiam View Post
On the other hand, I was born almost exactly 9 months after Valentine's Day.
My father was an accountant - I was born 9 months after the end of the financial year.

Dropbear
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  #15  
Old 22 December 2009, 12:39 AM
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Here's one study by month rather than day, based on students at Meredith College (an all-female college; this seems to be somebody's undergraduate thesis). The writer is comparing the patterns at her college with previous data for the US as a whole:

http://mste.illinois.edu/courses/mat...sisPape05.html

The data isn't broken down by day but the peak months are August and September, which apparently fits with other data.

Quote:
The typical United States pattern for births is a September peak and an April-May trough; April-May births correspond to July-August conceptions, some of the hottest months of the year in America.
(From the page before.)

Quote:
While many low points occur throughout the year, one day stands out above the rest with seventeen birthdays; this incident occurs on day 243 or August thirty-first, right in the middle of our two peak months.
That doesn't have much significance, but it's not December 20th anyway. It seems unlikely that a single day in December would be the most common birthday if there's an overall peak in August or September.
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  #16  
Old 22 December 2009, 01:43 AM
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Quote:
Originally Posted by Beejtronic View Post
Well, I don't know anyone with Dec. 20th as a birthday, therefore we can safely call this rumour false. Now let's never speak of this again.
Maybe not IRL, but I was born on December 20th. So, the rumour is obviously true.
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  #17  
Old 22 December 2009, 02:27 AM
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I would have thought that December 31 would be the most common in the US, because of the negative tax implications of recording the birth the next day.
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  #18  
Old 22 December 2009, 03:39 AM
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My stepfather's birthday is the 20th, however, of everyone else I know IRL, AFAIK, his is the only birthday that falls on that day.
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  #19  
Old 22 December 2009, 03:23 PM
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My brother's birthday is the 20th, and we know about four or five others. But he was in his 40s before we met his virtual siblings.

I, however, had a twin in high school and my birthday's in May.

Seaboe
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  #20  
Old 22 December 2009, 03:40 PM
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Quote:
Originally Posted by Steve Eisenberg View Post
I would have thought that December 31 would be the most common in the US, because of the negative tax implications of recording the birth the next day.
But if you're going to induce labor, you'd schedule it in advance. I don't think the OB surgeons would want to schedule an induction on New Year's Eve, which would require them then to do a follow up hospital visit on New Year's Day.
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