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.

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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 is 40 year marriage called?

ruby wedding anniversary The 40th wedding anniversary is known as a ruby wedding anniversary; both the traditional and modern gifts given on this very special occasion are ruby.

ernestjones.co.uk - 40th wedding anniversary - Occasions - Ernest Jones

40th Wedding Anniversary

The 40th wedding anniversary is known as a ruby wedding anniversary; both the traditional and modern gifts given on this very special occasion are ruby. Ruby is one of the most desirable gemstones. It is a fiery red coloured stone which is thought to symbolise love and passion. Ruby is given after 40 years of marriage as a reminder to the couple of the passion in the early days of their relationship. The 40th wedding anniversary is an opportunity to rekindle their profound love. At Ernest Jones we offer a wide range of ruby jewellery, perfect for the 40th anniversary. Our ruby jewellery includes earrings, pendants, and rings, treat your wife to something that suits her style whilst sticking to tradition. Eternity rings adorned with rubies are often given on the 40th wedding anniversary as a celebration of the many years spent in marriage.