Lunar Age: The mother's age at the time of conception is calculated using the Chinese lunar calendar. This is typically one to two years older than the Gregorian calendar age.

Lunar Month: The month of conception is also determined according to the lunar calendar, which is different from the Gregorian calendar system.

Gender Prediction: The predictor uses a chart that cross-references the lunar age and month to determine whether the baby is likely to be a boy or a girl.