BABY

A Breakdown of the Most Common Birthdays

Here’s where your baby’s birthday ranks in terms of popularity…

Written by

Happiest Baby Staff

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A baby girl celebrates her birthday with cake

Your baby’s birthday is undoubtedly a special day…but just how special is it? After all, certain months and dates boast more births than others. So, is your little one destined for a lifetime of shared school celebrations…or will they be blowing out the birthday candles on one of the rarest birthdays of the year? Keep reading to find out the most and least popular birthdays!

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What are the most common birthday dates?

September 9th takes the (birthday) cake as the most common birthday of the year. Some celebs who blow out their candles on this day include Adam Sandler, Michelle Williams, and Hugh Grant.

It’s one of nine birthdates that make up the top 10! And if you take a peek roughly nine months in the past, it’s easy to see why. Babies born in mid-September were likely conceived right around the holidays when perhaps expecting parents were feeling more festive than usual! (Read more September baby facts!)

The only non-September birthday in the top 10 is July 7th—possibly because that’s when folks who were holding out until after July 4th end up scheduling inductions or c-sections.

What is the most common birth month?

Despite the fact that September is so heavily represented in the top 10 most common birthdays, there are actually more births reported in August! All but one August birthday made the list of 100 most common birthdays (the exception being August 3, which lands at 116). Once again, if you do the math, the conception time for August babies lines up with the approach of cooler weather and the holidays, maybe making cuddling up extra appealing.

What is the least common birthday?

Unsurprisingly, February 29th is the least common birthday. Because Leap Day only rolls around every four years, there’s only a 1/1,461 chance of being born on this day (versus 1/365 for any other given day). This means that Leap Day babies (also called Leapers or Leaplings) are stuck celebrating on February 28th or March 1st (but we think their rare b-day also gives them a great excuse to throw a blowout every four years!). Since so few folks are born on this day, your baby won’t have too many celeb birthday “twins.” Famous Leaplings include rapper Ja Rule, fictional character Superman, motivational speaker Tony Robbins and musician Mark Foster (of Foster the People).

Other Uncommon Dates for Birthdays

Other dates that land at the bottom of the list include Christmas, New Year’s Day, Christmas Eve, and Independence Day, the day after Christmas, the day after New Year’s, and dates in late November. The reason? Hospitals are less likely to schedule inductions or c-sections on holidays!

The 13th is also a relatively rare birthday, with January, February, March, April, May, and November 13th all placing among the 50 least common birthdays. Superstition around Friday the 13th appears to be to blame here.

Least Popular Birthdays

February 29 (366th)
December 25 (365th)
January 1 (364th)
December 24 (363rd)
July 4 (362nd)
January 2 (361st)
December 26 (360th)
November 27 (359th)
November 23 (358th)
November 25 (357th)

Ranked From Most to Least Popular Birthday

Here's where every birthday ranks!

September 9
September 19
September 12
September 17
September 10
July 7
September 20
September 15
September 16
September 18
December 20
September 26
September 8
September 23
December 29
August 8
September 24
July 8
December 19
August 29
August 15
September 22
December 30
September 14
September 25
September 27
July 1
December 28
August 28
July 2
August 22
September 21
September 13
August 30
July 11
August 16
August 1
July 18
August 20
July 9
July 16
July 25
July 15
August 12
July 10
August 27
August 9
October 1
July 17
July 23
August 14
July 22
August 18
July 14
December 21
December 18
October 3
December 27
July 21
August 23
August 21
August 19
February 14
August 26
July 28
August 5
August 11
July 24
July 30
July 29
June 27
August 7
August 6
July 26
August 2
August 25
October 2
September 29
August 4
November 21
July 12
June 28
October 10
August 31
September 28
August 17
June 30
July 19
May 23
July 31
September 11
June 20
August 10
October 4
September 30
July 6
December 17
August 13
August 24
November 20
December 12
September 5
July 20
July 27
June 25
September 7
December 22
June 26
May 24
December 16
June 29
November 1
June 2
June 18
October 6
August 3
June 24
October 7
October 8
November 7
July 3
June 21
October 17
September 6
June 14
May 22
May 16
October 24
October 5
October 11
June 16
October 15
June 3
November 19
May 21
June 17
December 1
June 23
June 6
November 14
November 15
June 10
June 4
April 4
September 4
June 12
May 20
November 5
December 15
February 15
October 25
December 2
March 21
July 13
November 8
June 19
November 18
June 5
June 1
June 7
June 11
May 15
October 22
October 18
October 14
February 7
December 3
November 11
March 17
October 9
December 5
November 3
June 22
March 1
November 4
November 17
May 17
September 3
March 14
October 16
May 2
February 22
October 28
March 7
June 9
November 6
November 2
June 15
November 12
March 3
May 5
May 10
May 14
October 20
February 8
April 11
October 21
February 28
January 24
October 23
March 28
June 13
May 9
November 10
October 27
June 8
January 10
November 16
January 4
May 12
February 10
February 11
October 12
October 29
March 15
February 21
April 2
April 18
March 12
March 20
May 1
September 2
May 19
April 25
March 4
December 4
March 5
March 8
January 14
January 11
March 25
February 25
March 22
December 6
May 8
March 18
January 5
April 12
December 14
December 10
January 25
May 6
February 2
February 16
May 7
February 18
March 10
January 12
March 11
September 1
February 1
October 26
February 23
November 9
January 7
March 24
March 6
March 19
January 6
April 16
February 4
February 24
May 3
January 17
May 30
April 5
May 18
April 3
February 12
April 17
March 27
February 9
December 8
April 19
April 8
March 26
February 20
January 18
January 31
December 11
April 15
April 26
April 22
March 29
January 23
April 23
April 7
February 27
November 30
December 13
February 17
October 19
December 9
April 24
January 26
February 3
January 28
April 9
May 25
April 10
January 20
January 21
January 27
April 21
October 30
January 3
April 14
April 28
March 2
May 28
February 6
May 29
March 31
March 16
October 13
March 9
November 29
January 30
May 11
November 13
December 7
March 23
April 29
April 30
February 26
May 31
May 4
April 20
March 30
May 13
May 27
January 19
February 5
January 22
February 19
April 27
November 22
March 13
April 6
January 9
January16
January 13
January 8
February 13
January 29
January 15
July 5
May 26
December 31
April 13
December 23
April 1
November 28
November 26
November 24
October 31
November 25
November 23
November 27
December 26
January 2
July 4
December 24
January 1
December 25
February 29

Disclaimer: The information on our site is NOT medical advice for any specific person or condition. It is only meant as general information. If you have any medical questions and concerns about your child or yourself, please contact your health provider. Breastmilk is the best source of nutrition for babies. It is important that, in preparation for and during breastfeeding, mothers eat a healthy, balanced diet. Combined breast- and bottle-feeding in the first weeks of life may reduce the supply of a mother's breastmilk and reversing the decision not to breastfeed is difficult. If you do decide to use infant formula, you should follow instructions carefully.