A woman's age in the Chinese Baby Gender Prediction Chart is the Chinese age. The Chinese use the Chinese Lunar Calendar to calculate their ages. A Chinese baby is considered to be one year old when born and will add to their age on Chinese New Year Day.
For example, if a baby is born on the day before Chinese New Year Day, the baby becomes two years old on Chinese New Year Day. In other words, the baby is two years old on the second day it arrives the world.
This Chinese age calculation tool helps people to find out their current Chinese age. If you want to know a past Chinese age, such as pregnancy year, use the page of How To Calculate Chinese Age On Certain Date.