A child rubs his head after a Buddhist monk shaved his hair off during the ‘Children Becoming Buddhist Monks’ ceremony, in advance of Buddha’s birthday, at a Chogye temple on May 3, 2013 in Seoul, South Korea. The children will stay at the temple to learn about Buddhism for 14 days. Buddha was born approximately 2,557 years ago, and although the exact date is unknown, Buddha’s official birthday is celebrated on the full moon in May in South Korea, which is on May 17 this year. By Chung Sung-Jun/Getty Images.