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Birthday cakes are very commonplace in birthday celebrations. Here, a black forest cake is adorned with candles and a topper indicating the recipient's 40th birthday.

A birthday is the anniversary of the birth of a person, or figuratively of an institution. Birthdays of people are celebrated in numerous cultures, often with birthday gifts, birthday cards, a birthday party, or a rite of passage.

Many religions celebrate the birth of their founders or religious figures with special holidays (e.g. Christmas, Mawlid, Buddha's Birthday, and Krishna Janmashtami).

There is a distinction between birthday and birthdate (also known as date of birth): the former, except for February 29, occurs each year (e.g. January 15), while the latter is the complete date when a person was born (e.g. January 15, 2001).

Legal conventions

In most legal systems, one becomes a legal adult on a particular birthday when they reach the age of majority (usually between 12 and 21), and reaching age-specific milestones confers particular rights and responsibilities. At certain ages, one may become eligible to leave full-time education, become subject to military conscription or to enlist in the military, to consent to sexual intercourse, to marry with parental consent, to marry without parental consent, to vote, to run for elected office, to legally purchase (or consume) alcohol and tobacco products, to purchase lottery tickets, or to obtain a driver's licence. The age of majority is the age when minors cease to legally be considered children and assume control over their persons, actions, and decisions, thereby terminating the legal control and legal responsibilities of their parents or guardians over and for them. Most countries set the age of majority at 18, though it varies by jurisdiction.

A one-year-old girl playing with her birthday balloons in Bangladesh

Cultural conventions

A 90th birthday celebration at home

Many cultures have one or more coming of age birthdays:

The birthdays of historically significant people, such as national heroes or founders, are often commemorated by an official holiday marking the anniversary of their birth.

An individual's Beddian birthday, named in tribute to firefighter Bobby Beddia,[6] occurs during the year that their age matches the last two digits of the year they were born.[7]

In many cultures and jurisdictions, if a person's real birthday is not known (for example, if they are an orphan), then their birthday may be adopted or assigned to a specific day of the year, such as January 1.[8] The birthday of Jesus is celebrated at Christmas. Racehorses are reckoned to become one year old in the year following their birth on the first of January in the Northern Hemisphere and the first of August in the Southern Hemisphere.


Child with Snow White cake, circa 1910–1940.
A Korean child's birthday party at home
A voicemail from a child wishing his mother a happy birthday

In many parts of the world,[vague] an individual's birthday is celebrated by a party where a specially made cake, usually decorated with lettering and the person's age, is presented. The cake is traditionally studded with the same number of lit candles as the age of the individual, or a number candle representing their age. The celebrated individual will usually make a silent wish and attempt to blow out the candles in one breath; if successful, a tradition holds that the wish will be granted. In many cultures, the wish must be kept secret or it won't "come true". Presents are bestowed on the individual by the guests appropriate to their age. Other birthday activities may include entertainment (sometimes by a hired professional, i.e. a clown, magician, or musician), and a special toast or speech by the birthday celebrant. The last stanza of Patty Hill's and Mildred Hill's famous song, "Good Morning to You" (unofficially titled "Happy Birthday to You") is typically sung by the guests at some point in the proceedings. In some countries a piñata takes the place of a cake.

Name days

Main article: Name day

In some historically Roman Catholic and Eastern Orthodox countries,[a] it is common to have a 'name day', otherwise known as a 'Saint's day'. It is celebrated in much the same way as a birthday, but it is held on the official day of a saint with the same Christian name as the birthday person; the difference being that one may look up a person's name day in a calendar, or easily remember common name days (for example, John or Mary); however in pious traditions, the two were often made to concur by giving a newborn the name of a saint celebrated on its day of confirmation, more seldom one's birthday. Some are given the name of the religious feast of their christening's day or birthday, for example, Noel or Pascal (French for Christmas and "of Easter"); as another example, Togliatti was given Palmiro as his first name because he was born on Palm Sunday.

Official birthdays

Colored lanterns at the Lotus Lantern Festival in Seoul, South Korea, celebrating the anniversary of the Buddha's birthday

Some notables, particularly monarchs, have an official birthday on a fixed day of the year, which may not necessarily match the day of their birth, but on which celebrations are held. Examples are:

Distribution through the year

Interactive heat map of the birth ratio of each day of the year to the average in the US, and England and Wales
A birthday cake for an 18th birthday
Some restaurants place a birthday candle on the dessert of a birthday customer's choice
A young child preparing to extinguish the candle of his first birthday – 1983
The examples and perspective in this article deal primarily with the United States and New Zealand and do not represent a worldwide view of the subject. You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. (February 2020) (Learn how and when to remove this template message)

Birthdays are fairly evenly distributed through the year, with some seasonal effects.[10][11]

In the United States, there tend to be more births in September and October.[12] This may be because there is a holiday season nine months before (the human gestation period is about nine months), or because the longest nights of the year also occur in the Northern Hemisphere nine months before. However, it appears the holidays have more of an effect on birth rates than the winter: New Zealand, a Southern Hemisphere country, has the same September and October peak with no corresponding peak in March and April.[13] The least common birthdays tend to fall around public holidays, such as Christmas, New Year's Day and fixed-date holidays such as July 4 in the US.

In the United States between 1973 and 1999, September 16 is the most common birthday in the United States and December 25 the least common birthday (other than February 29, because of leap years).[14] In 2011, October 5 and 6 were reported as the most frequently occurring birthdays.[15]

In New Zealand, the most common birthday is September 29, and the least common birthday is December 25. The ten most common birthdays all fall within a thirteen-day period, between September 22 and October 4. The ten least common birthdays (other than February 29) are December 24–27, January 1–2, February 6, March 22, April 1 and April 25. This is based on all live births registered in New Zealand between 1980 and 2017.[13]

Positive and negative associations with culturally significant dates may influence birth rates. The study shows a 5.3% decrease in spontaneous births and a 16.9% decrease in Caesarean births on Halloween, compared to dates occurring within one week before and one week after the October holiday. In contrast, on Valentine's Day there is a 3.6% increase in spontaneous births and a 12.1% increase in Caesarean births.[16]

In Sweden 9.3% of the population is born in March and 7.3% in November when a uniform distribution would give 8.3%.[17]

Leap day

In the Gregorian calendar (a common solar calendar), February in a leap year has 29 days instead of the usual 28, so the year lasts 366 days instead of the usual 365.

A person born on February 29 may be called a "leapling" or a "leaper".[18] In common years, they usually celebrate their birthdays on February 28. In some situations, March 1 is used as the birthday in a non-leap year since it is the day following February 28.

Technically, a leapling will have fewer birthday anniversaries than their age in years. This phenomenon is exploited when a person claims to be only a quarter of their actual age, by counting their leap-year birthday anniversaries only. In Gilbert and Sullivan's 1879 comic opera The Pirates of Penzance, Frederic the pirate apprentice discovers that he is bound to serve the pirates until his 21st birthday rather than until his 21st year. For legal purposes, legal birthdays depend on how local laws count time intervals.

By religion


In Judaism, the rabbis are divided about celebrating this custom, although it was accepted by the majority of the faithful. In the Torah the only mention that is made of the birthday, refers to the celebration of Pharaoh's birthday in Egypt, as recorded in Genesis (Parashat Vaieshev) 40:20.[19]


Early centuries

Origen in his commentary "On Levites" writes that Christians should not only refrain from celebrating their birthdays, but should look on them with disgust as a pagan custom.[20] Saint's days were typically celebrated on the anniversary of their martyrdom or death, considered the occasion of or preparation for their entrance into Heaven or the New Jerusalem.


Ordinary folk celebrated their saint's day (the saint they were named after), but nobility celebrated the anniversary of their birth.[citation needed] The "Squire's Tale", one of Chaucer's Canterbury Tales, opens as King Cambuskan proclaims a feast to celebrate his birthday.[21]


The Catholic Church, the Eastern Orthodox Church and Protestantism, accept birthdays as part of their traditional culture. Jehovah's Witnesses abstain from it for a number of reasons including its pagan origins, its rejection by early Christians, the way it is negatively expounded in the Holy Scriptures and the customs associated with superstition and magic.[22]


The birthday does not reflect Islamic tradition, and because of this, the majority of Muslims refrain from celebrating it while for some it is not a problem, as long as it is not accompanied by behavior contrary to Islamic tradition.[23][24] A good portion of Muslims, (and Arab Christians), who have emigrated to the United States and Europe, celebrate birthdays as customary especially for children, while some abstain.[25] There is also much controversy regarding the permissibility of celebrating Mawlid, (the anniversary of the birth of Muhammad), as some Muslims judge the custom as an unacceptable practice according to Islamic tradition.[26]

Buddhism (Mahayana)

Main article: Buddha's birthday

Many monasteries celebrate the anniversary of Buddha's birth, usually in a highly formal, ritualized manner. They treat Buddha's statue as if it was Buddha himself, as if he were alive; bathing, and "feeding" him.[27]


Hindus celebrate the birth anniversary day every year when the day that corresponds to lunar month or solar month (Sun Signs Nirayana System – Sourava Mana Masa) of birth and has the same asterism (Star/Nakshatra) as that of the date of birth. That age is reckoned whenever Janma Nakshatra of the same month passes.

Hindus regard death to be more auspicious than birth since the person is liberated from the bondages of material society. Also, traditionally, rituals & prayers for the departed are observed on 5th and 11th day with many relatives gathering.


Sikhs celebrate the anniversary of the birth of Guru Nanak.

By region

Ancient Persia

According to Herodotus (5th century BC), of all the days in the year, the one which the Persians celebrate most is their birthday. It was customary to have the board furnished on that day with an ampler supply than common: the richer people eat wholly baked cow, horse, camel, or donkey (Greek: ὄνον), while the poorer classes use instead the smaller kinds of cattle.[28][29]

Ancient Rome

The Romans enthusiastically celebrated birthdays with hedonistic parties and generous presents.[30]


See also: Chinese first birthday, Chinese calendar, and East Asian age reckoning

The Chinese word for "year(s) old" (t , s , suì) is entirely different from the usual word for "year(s)" (, nián), reflecting the former importance of Chinese astrology and the belief that one's fate was bound to the stars imagined to be in opposition to the planet Jupiter at the time of one's birth. The importance of this duodecennial orbital cycle only survives in popular culture as the 12 animals of the Chinese zodiac, which change each Chinese New Year and may be used as a theme for some gifts or decorations. Because of the importance attached to the influence of these stars in ancient China and throughout the Sinosphere, East Asian age reckoning previously began with one at birth and then added years at each Chinese New Year, so that it formed a record of the suì one had lived through rather than of the exact amount of time from one's birth. This method—which can differ by as much as two years of age from other systems—is increasingly uncommon and is not used for official purposes in the PRC or on Taiwan, although the word suì is still used for describing age.

Traditionally, Chinese birthdays—when celebrated—were reckoned using the lunisolar calendar, which varies from the Gregorian calendar by as much as a month forward or backward depending on the year. Celebrating the lunisolar birthday remains common on Taiwan while growing increasingly uncommon on the mainland. Birthday traditions reflected the culture's deep-seated focus on longevity and wordplay. From the homophony in some dialects between ("rice wine") and (meaning "long" in the sense of time passing), osmanthus and other rice wines are traditional gifts for birthdays in China. Longevity noodles are another traditional food consumed on the day,[31] although western-style birthday cakes are increasingly common among urban Chinese. Hongbaos—red envelopes stuffed with money, now especially the red 100 RMB notes—are the usual gift from relatives and close family friends for most children. Gifts for adults on their birthday are much less common, although the birthday for each decade is a larger occasion that might prompt a large dinner and celebration.


The Japanese reckoned their birthdays by the Chinese system until the Meiji Reforms. Celebrations remained uncommon or muted until after the American occupation that followed World War II.[citation needed] Children's birthday parties are the most important, typically celebrated with a cake, candles, and singing. Adults often just celebrate with their partner.

North Korea

In North Korea, the Day of the Sun, Kim Il Sung's birthday, is the most important public holiday of the country,[32] and Kim Jong Il's birthday is celebrated as the Day of the Shining Star.[33] North Koreans are not permitted to celebrate birthdays on July 8 and December 17 because these were the dates of the deaths of Kim Il Sung and Kim Jong Il, respectively. More than 100,000 North Koreans celebrate displaced birthdays on July 9 and December 18 instead to avoid these dates. A person born on July 8 before 1994 may change their birthday, with official recognition.[34]

South Korea

See also: Korean birthday celebrations and Korean first birthday celebration

South Korea was one of the last countries to use a form of East Asian age reckoning for many official purposes.[35] Prior to June 2023, three systems were used together—"Korean ages" that start with 1 at birth and increase every January 1st with the Gregorian New Year, "year ages" that start with 0 at birth and otherwise increase the same way, and "actual ages" that start with 0 at birth and increase each birthday.[36] First birthday celebrations were heavily celebrated, despite usually having little to do with the child's age. In June 2023, all Korean ages were set back at least one year and official ages henceforth are reckoned only by birthdays.[37]

See also


  1. ^ Quinceañeras – Hispanic Culture. Retrieved on 2013-01-01.
  2. ^ Birthday traditions Archived 2013-05-24 at the Wayback Machine.
  3. ^ Sacred Thread Ceremony Archived 2009-03-04 at the Wayback Machine. (2006)
  4. ^ Queen and anniversary messages. Retrieved on 2013-01-01. Archived February 15, 2009, at the Wayback Machine
  5. ^ Rabbi Shraga (2000-01-17) ABC's of Bar/Bat Mitzvah. Retrieved on 1 January 2013.
  6. ^ A Firefighter's Theorem. Retrieved on 2014-12-27.
  7. ^ Beddian Theory. Retrieved on 2014-12-27.
  8. ^ On New Year's Day, wish a 'Happy Birthday' to 202,000 refugees. Retrieved on 2013-01-01.
  9. ^ "Kim Jong-un's birthday remains unmarked in 2019 calendars". The Korean Herald. Yonhap. 4 December 2018. Retrieved 22 December 2018.
  10. ^ Murphy, Ron. "An Analysis of the Distribution of Birthdays in a Calendar Year". Retrieved 2011-12-27.
  11. ^ Mathers, C D; R S Harris (1983). "Seasonal Distribution of Births in Australia". International Journal of Epidemiology. 12 (3): 326–331. doi:10.1093/ije/12.3.326. PMID 6629621.
  12. ^ " Birthdate Search". American Automated Systems. Archived from the original on 20 October 2009. Retrieved 1 October 2009.((cite web)): CS1 maint: unfit URL (link)
  13. ^ a b "Most common birthday in New Zealand". Statistics New Zealand. Retrieved 2 October 2018.
  14. ^ "How Common Is Your Birthday?". The New York Times. 2006-12-19.
  15. ^ Christina Ng (2011-10-05) Oct. 5: America’s Most Common Birthday ABC News
  16. ^ Greenwood, Michael. (2011-10-10) Halloween, Valentine’s Day Found to Influence Birth Timing Archived 2013-06-09 at the Wayback Machine. Retrieved on 2013-01-01.
  17. ^ Swedish statistics board
  18. ^ Hall, C. (February 29, 2008), "Leap Year Babies Hop Through Hoops of Joy, Pain of Novelty Birthday", Detroit Free Press
  19. ^ Lebovits, Dovid. "Happy Birthday" (PDF). Halachically Speaking. 9 (11): 1–11.
  20. ^ John Bugge (1975). Early Christians,” notes The World Book Encyclopedia, “considered the celebration of anyone’s birth to be a pagan custom.” The ancient Greeks, for instance, believed that each person had a protective spirit that attended the person’s birth and thereafter watched over him. That spirit “had a mystic relation with the god on whose birthday the individual was born,” says the book The Lore of Birthdays. Birthdays also have a long-standing and an intimate link with astrology and the horoscope.11 Besides rejecting birthday customs on account of pagan and spiritistic roots, God’s servants of old likely rejected them on principle as well. Why? These were humble, modest men and women who did not view their arrival in the world as so important that it should be celebrated. (Micah 6:8; Luke 9:48) Rather, they glorified Jehovah and thanked him for the precious gift of life.—Psalm 8:3, 4; 36:9; Revelation 4:11. Virginitas: an essay in the history of a medieval ideal, Springer ISBN 9024716950, p. 69
  21. ^ Margaret Hallissy (1995) A Companion to Chaucer's Canterbury Tales, Greenwood Publishing Group ISBN 0313291896, p. 300
  22. ^ "Why Don't Jehovah's Witnesses Celebrate Birthdays? | FAQ". JW.ORG. Retrieved 15 April 2022.
  23. ^ Birthday parties | IslamToday – English Archived 2012-06-28 at the Wayback Machine. Retrieved on 2013-01-01.
  24. ^ Souhail Karam (2008-08-31). "Birthday parties against Islam says top Saudi cleric". Reuters. Retrieved 2011-07-06.
  25. ^ Mona H. Faragallah, Walter R. Schumm, Farrell J. Webb (1997). Acculturation of Arab-American Immigrants: An Exploratory Study. Journal of Comparative Family Studies. Dr. George Kurian. pp. 182–203.((cite book)): CS1 maint: multiple names: authors list (link)
  26. ^ Imam Jalaluddin al-Suyuti (radi Allahu anhu). "Celebrating Eid-e-Milad-un-Nabi" (PDF). Archived from the original (PDF) on 4 August 2016.
  27. ^ Sarah J. Horton (2007) Living Buddhist statues in early medieval and modern Japan, Palgrave Macmillan ISBN 1403964203 p. 24
  28. ^ "Herodotus iii. Defining the Persians". Retrieved 21 November 2017.
  29. ^ "Internet History Sourcebooks". Archived from the original on 2015-11-29. Retrieved 2017-12-10.
  30. ^ Kathryn Argetsinger (1992). "Birthday Rituals: Friends and Patrons in Roman Poetry and Cult". Classical Antiquity. 11 (2): 175–193. doi:10.2307/25010971. JSTOR 25010971.
  31. ^ Li Xiaoxiang. Origins of Chinese People and Customs (2004) p. 101. Asiapac Books (Singapore). ISBN 9812293841.
  32. ^ MacLeod, Calum (26 April 2013). "Korean defectors recall 'Day of the Sun'". USA Today. Contributing: Jueyoung Song, Duck Hwa Hong. Retrieved 6 April 2015.
  33. ^ Neville, Tim (15 February 2015). "Happy birthday? North Korea celebrates Kim Jong Il's legacy". CNN. Retrieved 21 April 2016.
  34. ^ Ju Seongha (2011-12-30) 北 김정은 시대 北 12월 17일生 사라진다.
  35. ^ Kelly Ng; Yuna Ku. "South Koreans become younger under new age-counting law". BBC. Retrieved 2023-07-29.
  36. ^ "The Unique Age Counting System of Korea 상세보기|Citizen JournalistsEmbassy of the Republic of Korea to Norway". Retrieved 2021-11-25.
  37. ^ Kim, Min Joo (8 December 2022), "South Koreans to Become Year Younger after Scrapping Traditional Age System", The Washington Post, Seattle: Nash Holdings.


  1. ^ Examples include Italy, Spain, France, parts of Germany, Poland, Russia, Romania, Bulgaria, Serbia, Slovakia, Czech Republic, Hungary, Greece, Lithuania, Latvia, and throughout Latin America.