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.
Based on Harvard University research of birth records in the United States between 19, 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).
In New Zealand, the ten most common birthdays all fall within a thirteen-day period, between September 19 and October 1, corresponding to conception in December.
Most countries set the age of majority between 18 and 21.
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 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.
In contrast, on Valentine's Day there is a 3.6% increase in spontaneous births and a 12.1% increase in Caesarean births.
A person's birthday and birthminute is usually recorded according to the time zone of the place of birth.
The least common birthdays tend to fall around public holidays, such as Christmas, New Years Day and fixed-date holidays such as July 4 in the US.