When is the birthday of a ten-year-old child in the calendar?

How can the birthday of a ten-year-old child be related to a perpetual calendar? The perpetual calendar is a reference book, which can be used to find the year from Guangxu of Qing Dynasty to 2050 (which has been published at present), and a ten-year-old child can know the specific date of birth by looking up his birth certificate. If you want to know the lunar calendar when he was born, it is very convenient to find it through the perpetual calendar.