Different charts

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There is only one Chinese Gender Chart instead of multiple ones. You may find different versions of the chart from different sites. If you see different ones, it's must be a wrong one caused by copying mistakes or other reasons.

The Chinese gender chart is based on factors including the Chinese lunar calendar, five elements, yin and yang, the eight diagrams, etc. Its accuracy is much higher than other free gender prediction tools online but it couldn't be higher than that of the ultrasound scanning. It's proved that the accuracy for the chart is about 70%. However, there is no scientific basis to the Chinese birth chart. So, you'd better use it carefully and better take the prediction result with a grain of salt.

https://www.yourchineseastrology.com/calendar/baby-gender-predictor.htm