Zhu ni sheng ri kuai le

China
The Chinese typically only celebrate certain birthdays: the first, 10th, 60th, 70th, and 80th. The 60th birthday is important to the hinese because it is seen as completing a full zodiac (12 x 5 = 60). While they don't celebrate their birthday each year, they do hold fast to unique traditions when the birthday celebrations roll around.
Birthdays are typically family affairs. Food includes a bowl of long-life noodles, long noodles that the person slurps into their mouth. It is believed that a long slurp equals a long life for the birthday person. The Chinese say Zhu ni sheng ri kuai le, which means "happy birthday to you."
Mexico
A Mexican party is called a fiesta and includes traditional food items, such as tacos and a candy-filled paper mache figure (pinata) that is hit with a stick until it bursts open and candy spills everywhere for the party guests to enjoy.
A very important tradition in Mexican culture is the Quinceanera, which is traditionally celebrated on a young woman's fifteenth birthday. The celebration is meant to mark the young girl's movement into womanhood and is complete with a formal gown, dancing, and a tiered cake. It is comparable to a wedding reception in its scope.


I reland
An Irish birthday is celebrated with a gathering of family and friends. Traditional Irish foods, drinks, singing, and dancing are all part of the festivities.
One unusual Irish tradition is "bumping" the birthday child. An adult turns the child upside down and very gently bumps his head on the floor. The number of bumps equals the age of the child. For those who come of age, usually 21 in Ireland, the "key of the house" is given. This signifies that the person is an adult and can come and go as he pleases.


Brazil
Birthday parties for kids in Brazil are traditionally large, extravagant affairs. There are even specific event venues called buffet infantile, whose sole purpose is hosting kid's birthday parties. No party is complete without an elaborate dessert and candy table that includes gift bags guests can fill and take home. The cake is the centerpiece of this dessert table and is surrounded by a huge variety of sweet treats.
The special birthday person is given the first piece of cake but doesn't keep it to himself. Instead, he gives this piece to an important person in his life, like his mom or dad. It is a great honor to be given the birthday boy/girl's slice of sweet.


Denmark

T he Danish flag is usually flagged on a birthday, if you don't have a flagpole is it common to use a mini flag and put it outside your front door.

Danish children’s birthday parties are usually pretty modest, compared to the competitive birthday parties you see in other countries, with magicians and bouncy castles and so forth. In Denmark, the kids eat some buns, play some games, eat some layer cake, and go on a treasure hunt, and go home with a bag of candy. In my daughter’s class they actually do communal birthday parties – all the kids born in winter get together for one party, all the kids born in spring get together, etc. This is great, because everybody gets invited, and you have four or five other parents to help plan the party with.


Nepal
In Nepal it is traditional to smear the forehead of the birthday-haver with coloured yoghurt. People think that the mark will bring good luck on their birthday. Children also have their head shaved while being held by a special fire on their first birthday.