liping is twelve years old,but he has only three birthdays.why?

李平十二岁，但他只过了三个生日，为什么呢？

Because he was born on February 29th in a leap year. We only have one February 29th every four years.
因为他出生在闰年的二月二十九日。每四年过一次生日。

2月29号生的么

2.29生日！！