Chinese Astrology uses Five Elements (Five Elements, Metal, Water, Wood, Fire and Earth) relationship to predict people's fortune. If you are a woman you can know which Element represents your son using the Mother-and-Child Relationship of Five Elements. If you are a man you can know which Element represents your son using the Father-and-Son Relationship of Five Elements.
If the element of the son appears in the Chinese astrological cycle, then that year might be the birth year of the son. Sometimes, the element of the son is not strong (low scores) in the yearly cycle; but the element of the son shows high scores in the monthly cycle. Then that month might be the birth month of the son.
Remember that the duration of pregnancy is about 10 months. So the conception month is about 10 months before the birth month of the son.
Find the Birth Month of Your Son
Select a year and click the Display Monthly Five Elements in the Selected Year button to list out 12 months of the Yin Yang Five-Element signs on that year.
If there is an element sign of baby boy in the year and the element sign of baby boy in a certain month, then the mother has a better chance to have a baby boy on that month with a natural birth. This information can help women to determine the conception month.
If there is NO element sign of baby boy in the year, then the only chance to have a baby boy is to find two element signs of baby boy in the month.