A birthday marks the special day you were born.
Each year on your birthday you turn one year older. Many families celebrate with cake, songs, and games.
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Blowing out candles on a cake is a birthday tradition.
Balloons float when they are filled with a light gas called helium.
People sing the 'Happy Birthday' song all around the world.
In Vietnam, some families celebrate a baby's first full month.
The most candles ever lit on one birthday cake was over 72,000.