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Summary 9 out of 10 of the most common birthdays are in September . However, August is the most commmon birth month, with an average of 361,709 August babies each year in the United States. February is the least common birth month, with avereage of 316,891 babies born in February annually. Tuesday is the most common day of the week for births in America.

The highest percentage of births occur at 8 a.m. and noon .

There were 3,659,289 births in the United States in 2021

The ratio of sexes at birth is 1.05 males per 1 female in the U.S.

Happy birthday to you, and you, and many more.

It’s not uncommon to share a birthday with someone you know. Anyone who has ever had a communal office birthday cake knows some months the cake has more names iced on than others. It turns out, it’s not just days that are more common, but some months (And one in particular!) are booming when it comes to births and some months when the delivery room is downright slow.

The 10 Most Popular Birthdays

September 9th September 19th September 12th September 17th September 10th July 7th September 20th September 15th September 16th September 18th September is a busy month for delivering babies! And for birthday cakes, party hats, and other birthday related accessories. 9 of the 10 most popular birthdays are in September. The one not in September? July 7th, just 3 days after Independence Day. For those struggling to do the math, 9 months before these popular September birthdays is a slew of December dates, including December 25th.

Which is kind of funny, considering the least popular birth dates…

10 Least Popular Birthdays

December 25th January 1st December 24th July 4th January 2nd December 26th November 27th November 23rd November 25th October 31st While holidays are a popular time for baby making, babies are less likely to be born on popular holidays. Christmas, New Years, Christmas Eve, July 4th, Halloween, and some suspiciously Thanksgiving days all make the top 10 least common birthdays. In a world of scheduled c-sections and inductions, doctors and delivery staff prefer to be home with their families on the big holidays than helping expand someone else’s families. Another day where births are less common? The 13th. Guess people are still superstitious about the “unlucky” day.

How We Determined This (And The Full Calendar)

To rank the most common birthdays, we used data aggregated by FiveThirtyEight on the number of births on each day between 1994 to 2014.. This data set took birth data for the years 1994 to 2003, from the Centers for Disease Control and Prevention’s National Center for Health Statistics. U.S. births data for births between 2000 to 2014 came from the Social Security Administration. The more babies born on average, the more common the birthday. The calendar featured at the top of the article is a simple heat map of the data. The deeper the blue, the more people with that birth date. The deeper red, the less birth dates. It is worth noting that the deepest red is for months with no 31st day. You can see the full calendar year and how common of a birthday your special day is below.

How common of a birth date is each day in the calendar year?

Birth Date Popularity Average Births 1/1 365th 7,792 1/2 362nd 9,307 1/3 306th 10,813 1/4 209th 11,019 1/5 237th 10,953 1/6 259th 10,911 1/7 255th 10,925 1/8 343rd 10,610 1/9 340th 10,624 1/10 207th 11,023 1/11 230th 10,975 1/12 248th 10,934 1/13 342nd 10,622 1/14 228th 10,976 1/15 346th 10,546 1/16 341st 10,623 1/17 264th 10,901 1/18 278th 10,883 1/19 332nd 10,691 1/20 301st 10,825 1/21 302nd 10,824 1/22 334th 10,673 1/23 285th 10,865 1/24 199th 11,049 1/25 240th 10,951 1/26 295th 10,843 1/27 303rd 10,823 1/28 297th 10,835 1/29 345th 10,567 1/30 318th 10,752 1/31 278th 10,883 2/1 251st 10,929 2/2 242nd 10,949 2/3 295th 10,843 2/4 261st 10,905 2/5 333rd 10,685 2/6 311th 10,794 2/7 164th 11,149 2/8 195th 11,063 2/9 272nd 10,893 2/10 211th 11,015 2/11 211th 11,015 2/12 269th 10,898 2/13 344th 10,604 2/14 63rd 11,636 2/15 150th 11,188 2/16 244th 10,948 2/17 291st 10,854 2/18 246th 10,940 2/19 334th 10,673 2/20 277th 10,886 2/21 216th 11,008 2/22 182nd 11,111 2/23 253rd 10,927 2/24 262nd 10,904 2/25 231st 10,974 2/26 325th 10,727 2/27 288th 10,858 2/28 198th 11,053 2/29 347th 10,462 3/1 174th 11,129 3/2 309th 10,802 3/3 190th 11,074 3/4 225th 10,989 3/5 227th 10,979 3/6 256th 10,921 3/7 184th 11,087 3/8 228th 10,976 3/9 316th 10,765 3/10 246th 10,940 3/11 249th 10,931 3/12 219th 11,003 3/13 338th 10,654 3/14 178th 11,119 3/15 215th 11,011 3/16 314th 10,773 3/17 169th 11,137 3/18 236th 10,954 3/19 258th 10,914 3/20 219th 11,003 3/21 153rd 11,181 3/22 233rd 10,967 3/23 322nd 10,739 3/24 256th 10,921 3/25 231st 10,974 3/26 276th 10,888 3/27 271st 10,895 3/28 201st 11,045 3/29 284th 10,873 3/30 328th 10,714 3/31 313th 10,779 4/1 353rd 10,300 4/2 217th 11,004 4/3 267th 10,899 4/4 144th 11,219 4/5 266th 10,900 4/6 339th 10,639 4/7 287th 10,859 4/8 275th 10,890 4/9 298th 10,830 4/10 300th 10,826 4/11 196th 11,059 4/12 237th 10,953 4/13 351st 10,389 4/14 307th 10,812 4/15 278th 10,883 4/16 260th 10,909 4/17 270th 10,897 4/18 217th 11,004 4/19 274th 10,891 4/20 328th 10,714 4/21 304th 10,817 4/22 283rd 10,877 4/23 286th 10,864 4/24 294th 10,845 4/25 224th 10,996 4/26 282nd 10,882 4/27 336th 10,664 4/28 308th 10,803 4/29 323rd 10,735 4/30 324th 10,731 5/1 221st 11,002 5/2 181st 11,113 5/3 263rd 10,903 5/4 327th 10,717 5/5 191st 11,073 5/6 242nd 10,949 5/7 245th 10,945 5/8 235th 10,955 5/9 203rd 11,040 5/10 192nd 11,071 5/11 319th 10,744 5/12 210th 11,016 5/13 330th 10,697 5/14 193rd 11,070 5/15 162nd 11,157 5/16 127th 11,283 5/17 177th 11,122 5/18 267th 10,899 5/19 223rd 10,999 5/20 147th 11,193 5/21 135th 11,254 5/22 125th 11,288 5/23 89th 11,525 5/24 109th 11,367 5/25 299th 10,827 5/26 349th 10,401 5/27 331st 10,693 5/28 310th 10,797 5/29 312th 10,782 5/30 264th 10,901 5/31 326th 10,719 6/1 158th 11,164 6/2 113th 11,345 6/3 133rd 11,256 6/4 143rd 11,221 6/5 158th 11,164 6/6 139th 11,240 6/7 160th 11,160 6/8 206th 11,025 6/9 185th 11,083 6/10 142nd 11,222 6/11 160th 11,160 6/12 146th 11,196 6/13 202nd 11,041 6/14 125th 11,288 6/15 188th 11,078 6/16 131st 11,265 6/17 136th 11,253 6/18 114th 11,339 6/19 156th 11,176 6/20 92nd 11,502 6/21 122nd 11,298 6/22 172nd 11,130 6/23 138th 11,244 6/24 117th 11,328 6/25 105th 11,406 6/26 108th 11,374 6/27 71st 11,590 6/28 82nd 11,557 6/29 111th 11,351 6/30 87th 11,547 7/1 27th 11,860 7/2 30th 11,828 7/3 121st 11,304 7/4 363rd 8,796 7/5 348th 10,404 7/6 96th 11,487 7/7 6th 12,108 7/8 18th 11,944 7/9 40th 11,769 7/10 45th 11,738 7/11 35th 11,794 7/12 81st 11,565 7/13 153rd 11,181 7/14 54th 11,680 7/15 43rd 11,754 7/16 41st 11,768 7/17 49th 11,718 7/18 38th 11,772 7/19 88th 11,545 7/20 103rd 11,428 7/21 59th 11,664 7/22 52nd 11,686 7/23 50th 11,699 7/24 68th 11,607 7/25 41st 11,768 7/26 74th 11,581 7/27 104th 11,410 7/28 65th 11,614 7/29 70th 11,593 7/30 69th 11,599 7/31 90th 11,516 8/1 37th 11,775 8/2 75th 11,580 8/3 116th 11,332 8/4 79th 11,569 8/5 66th 11,610 8/6 73rd 11,586 8/7 72nd 11,589 8/8 16th 11,951 8/9 47th 11,721 8/10 93rd 11,491 8/11 67th 11,608 8/12 44th 11,749 8/13 98th 11,468 8/14 51st 11,692 8/15 21st 11,921 8/16 36th 11,788 8/17 86th 11,548 8/18 53rd 11,681 8/19 62nd 11,637 8/20 39th 11,771 8/21 61st 11,643 8/22 31st 11,825 8/23 60th 11,655 8/24 99th 11,452 8/25 76th 11,576 8/26 64th 11,620 8/27 46th 11,737 8/28 28th 11,855 8/29 20th 11,924 8/30 34th 11,800 8/31 84th 11,555 9/1 250th 10,930 9/2 222nd 11,000 9/3 178th 11,119 9/4 145th 11,216 9/5 102nd 11,431 9/6 124th 11,293 9/7 106th 11,398 9/8 13th 11,992 9/9 1st 12,301 9/10 5th 12,143 9/11 91st 11,503 9/12 3rd 12,224 9/13 33rd 11,801 9/14 24th 11,882 9/15 8th 12,087 9/16 9th 12,072 9/17 4th 12,148 9/18 10th 12,055 9/19 2nd 12,229 9/20 7th 12,107 9/21 32nd 11,813 9/22 22nd 11,920 9/23 14th 11,974 9/24 17th 11,945 9/25 25th 11,866 9/26 12th 11,993 9/27 26th 11,861 9/28 85th 11,554 9/29 77th 11,572 9/30 95th 11,489 10/1 48th 11,720 10/2 77th 11,572 10/3 57th 11,674 10/4 94th 11,490 10/5 129th 11,272 10/6 115th 11,335 10/7 118th 11,324 10/8 119th 11,309 10/9 169th 11,137 10/10 83rd 11,556 10/11 130th 11,268 10/12 213th 11,014 10/13 315th 10,768 10/14 164th 11,149 10/15 132nd 11,261 10/16 180th 11,115 10/17 123rd 11,296 10/18 164th 11,149 10/19 292nd 10,850 10/20 194th 11,065 10/21 197th 11,057 10/22 163rd 11,156 10/23 200th 11,046 10/24 128th 11,276 10/25 151st 11,183 10/26 252nd 10,928 10/27 205th 11,032 10/28 183rd 11,102 10/29 214th 11,012 10/30 305th 10,815 10/31 357th 9,978 11/1 112th 11,350 11/2 186th 11,081 11/3 172nd 11,130 11/4 174th 11,129 11/5 148th 11,191 11/6 186th 11,081 11/7 120th 11,308 11/8 155th 11,180 11/9 253rd 10,927 11/10 204th 11,039 11/11 168th 11,141 11/12 189th 11,077 11/13 320th 10,742 11/14 139th 11,240 11/15 141st 11,229 11/16 208th 11,022 11/17 176th 11,125 11/18 157th 11,173 11/19 134th 11,255 11/20 100th 11,442 11/21 80th 11,567 11/22 336th 10,664 11/23 359th 9,883 11/24 356th 10,015 11/25 358th 9,954 11/26 355th 10,044 11/27 360th 9,718 11/28 354th 10,096 11/29 317th 10,764 11/30 289th 10,855 12/1 137th 11,251 12/2 152nd 11,182 12/3 167th 11,142 12/4 226th 10,981 12/5 171st 11,132 12/6 234th 10,958 12/7 321st 10,741 12/8 272nd 10,893 12/9 293rd 10,849 12/10 240th 10,951 12/11 278th 10,883 12/12 101st 11,440 12/13 289th 10,855 12/14 239th 10,952 12/15 148th 11,191 12/16 110th 11,352 12/17 97th 11,481 12/18 56th 11,675 12/19 19th 11,935 12/20 11th 12,009 12/21 54th 11,680 12/22 107th 11,388 12/23 352nd 10,338 12/24 364th 8,069 12/25 366th 6,574 12/26 361st 9,543 12/27 58th 11,665 12/28 28th 11,855 12/29 15th 11,956 12/30 23rd 11,889 12/31 350th 10,394

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