This article discusses the relationship between Sex Ratio at Birth of China and the Chinese Baby Gender Predictor Chart. This will help us to know if Chinese Baby Gender Predictor Chart is accurate.
The Chinese Baby Gender Chart is a very popular topic on the Internet since 1998. People keep asking how accuracy the prediction of Chinese Baby Gender Chart is. According to the 2017 data bank from United Nations Population Division shows the sex ratio of male births per female births is 1.073. The China's sex ratio at birth is 1.15. According to the birth data at US Centers for Disease Control (CDC), the US sex ratio between males and females is 1.048. Girls like to be born in USA.
Baby Sex Ratio at Birth in China
Decades ago some scientists had researched what might influence the sex ratio at birth. They documented the seasons and regions affect the sex ratio at birth. US National Center for Biotechnology Information published a study of The Association between Season of Pregnancy and Birth-Sex among Chinese in 2014. The statistic data is from 3051 Chinese children born in the Northeast regions of China during 2006 to 2008. Among 3051 children, there are 1582 boys (51.8%), and 1469 girls (48.2%) The Chinese sex ratio of boy per girl is 1.0769. The following is the monthly sex ratio chart.
August, February, March, April are highest sex ratio months. December, January and October are above the average. The sex ratios of pregnant seasons are quite different.
- The Spring is 1.241
- The Summer is 0.967
- The Autumn is 1.121
- The Winter is 1.020
The spring time in China is February, March and April. The summer time is May, June and July. The study stated that Chinese mothers pregnant in spring had a higher probability of delivering boys than those pregnant in summer.
The sex ratio at city region is 1.085. The sex ratio at rural region is 1.061. The sex ratio of women younger than 30 is 1.083. The sex ratio of women older than 29 is 1.052.
Review Chinese Baby Gender Predictor Chart
The chart below is the Chinese Baby Gender Predictor Chart. The age in the chart is woman's Chinese age at conception. The month in the chart is the month of the conception. Because the chart is from Ching 
Dynasty, people think the month should be the Chinese Lunar Month. For the prediction, blue is for boy and pink is for girl.
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We are interested the association between conception month and the probability to have baby boy. Therefore, we sum up the boy counts for each month.
| Lunar Month | Near Zodiac | Proximity Month | Boy Counts |
| 1 | Tiger | February | 16 |
| 2 | Rabbit | March | 15 |
| 3 | Dragon | April | 15 |
| 4 | Snake | May | 13 |
| 5 | Horse | June | 11 |
| 6 | Sheep | July | 11 |
| 7 | Monkey | August | 13 |
| 8 | Chicken | September | 16 |
| 9 | Dog | October | 14 |
| 10 | Pig | November | 12 |
| 11 | Rat | December | 13 |
| 12 | Cow | January | 15 |
Now we can see that January, February, March, April and September have higher boy counts.
The Chinese I-Ching has a theory to support this prediction. This probably is something to do with Chinese I-Ching Hexagrams. I-Ching states the natural phenomena of our universe, and then applies it on people, family and the nation relationships. The nature rule of the universe (Dao) is Yin and Yang. I-Ching uses the symbol of broken bar 
as Yin and the solid bar 
as Yang. Yin is female or cold. Yang is male or hot. One trigram has 3 bars and one hexagram has 6 bars. Yin-Yang and Hexagram can apply on the months. Each month has its own hexagram. December has the first Yang growing from the ground. January has two Yangs on the ground. February has three Yangs on the ground. March has four Yang bars and April has five Yang bars. Full six Yangs are in May. In June, Yang completely dies and Yin is born.
