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What is the rarest birthday?

Christmas Day December 25 (Christmas Day) is the least common birthday, while January 1 (New Year's Day) is the second least common. December 24 (Christmas Eve) also makes the list as the 3rd least common birthday while July 4 (Independence Day) is the 4th least common birthday.

parents.com - These Are the Most Common Birthdays—And the Least - Parents

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Knowing your due date means knowing much more than when you can expect your little one to arrive. It will determine anything and everything from the logistics around your labor and delivery to the time of year your child will celebrate their birthday. Curious to know if your kid on the way will be celebrating during the most common birthday month along with plenty of classmates? Or maybe they'll be born on the least common day of the year for babies to make their big entrance into the world? Thanks to a viral blog post from The Daily Viz's Matt Stiles, you can figure that out.

The Data

Arguably the coolest part of Stile's viral post is that the data is spread out in a colorful heat map, making the numbers less of a headache to sift through. The beautiful display reveals that September is a busy month for birthing. But the data also shows that as much fun as it is to figure out how rare your birthday may (or may not) be, the system has a teeny flaw: The busiest days for births are not that much busier than the rarer days. As the author notes, the busiest days on the calendar have 12,000 births, and the least busy have around 6,500 with 11,00 as the median. Still, it is pretty fun to check out. Curious to see where your child's expected birthday lands? Here's the scoop on the most common birthdays in the U.S.

The Most Common Birth Month

Using real birth data (covering 20 years of American births) gathered by FiveThirtyEight from the National Center for Health Statistics and Social Security Administration, Stiles concluded that September is the most popular month to give birth to a child in the U.S. In fact, nine of the top 10 days to give birth fall between September 9 and September 20.

So, then, the question is, of course, why?

"If you back up 38 weeks, that means many couples are conceiving in December and around the holidays," explains Whitney Casares, M.D., M.P.H., F.A.A.P, author of The New Baby Blueprint: Caring for You and Your Little One. "It makes sense that they may be more likely to conceive during more celebratory seasons." Another reason, Dr. Casares points out: According to a study in Obstetrics and Gynecology, couples may have more luck conceiving during the winter season due to higher-quality sperm in winter versus summer months. "They also postulated that changes in daylight length might make an ovum’s environment better-suited for a sperm," she notes. "More research is needed to understand this interesting phenomenon.

The Most Common Birthdays

Experian landed on September 9 as the most common birthday in the U.S. It's shared by comedian Adam Sandler, actor Hugh Grant, jazz singer Michael Bublé, Russian literary giant Leo Tolstoy, and Colonel Sanders, the founder of KFC. September 19 is the second most common birthday, followed by September 12, September 17, September 10, and the first non-September date in the mix: July 7.

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What month is the smartest?

travelandleisure.com - The Smartest People Were Born in This Month, Study Suggests (Video)

You may think you're smart — but are you smarter than someone born in September?

Those born in September are, apparently, the smartest out of the entire year. According to Marie Claire, a study published in the National Bureau of Economic Research found that there's a clear correlation between the month during which you were born and how smart you are. The study, entitled "School Starting Age and Cognitive Development," found that schoolchildren born in September were more likely to have higher GPAs than those born in any other month. But don't worry, everybody else born in the 11 other months: It's not like a September baby's (perceived) intelligence was the cause of annual divine intervention in the ninth month of the year. The school system is set up to favor children born around this time. Researchers found that "being relatively old for grade (being born in September versus August)" was more likely to result in better grades. This seems to be supported by the fact that those born in August — and are 11 months younger — were most likely to have the lowest grades. However, this study took place in Florida where the cut-off for school enrollment is Sep. 1. In other states, like New York, that cut-off can be as late as Dec. 31, which would likely skew results. But also, apparently, the study found out that those born in September were the least likely to go to prison, according to Marie Claire. So there may be something to the ninth month magic, after all.

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