Chinese Gender Predictor Accuracy for Singapore Women?

The Chinese Baby Gender Predictor uses the Chinese Baby Gender Statistics Chart of Ching Ching Character Dynasty to predict baby gender by woman's pregnancy age and conception month. They said it helped couples to plan for next baby with desired gender in Ching Dynasty.

People doubt about the accuracy of Chinese Baby Gender Prediction Calendar Chart. Years ago scientists form different countries had researched and reported that 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. By using the same data, we study the relationship between Chinese Gender Predictor Chart and China sex ratio at Birth. We discovered that Chinese Baby Gender Predictor Chart is somewhat accurate but not precise in China. Most of population in Singapore is Chinese. We would like to know if Chinese Baby Gender Predictor works for Singapore women.

Chinese Baby Gender Prediction Chart

Since seasons influence sex ratio at birth, we want to study the relationship between conception months and baby gender. The following is the Chinese Baby Gender Statistic Chart. The age in the chart is woman's Chinese age at conception. The month in the chart is the month of the conception. For the prediction, blue is for boy and pink is for girl.

Age	Woman's Conception Chinese Lunar Month
Age	1	2	3	4	5	6	7	8	9	10	11	12
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

We are interested which conception months have better chances to have a 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

After the calculation, we find that January, February, March, April and September have higher boy counts.

The Chinese Baby Gender Calendar Chart predicts that women have a better chance to have baby boys if conceiving in January, February, March, April, and September.

Chinese Gender Predictor Accuracy for Singapore?

Singapore Department of Statistics publishes Birth Data by Sex, Ethnic Group and Month from 1960 to 2018. We collect data from January 1960 to December 2017. Total of birth data is 2,624,867. The male count is 1,356,317 and female count is 1,268,550. The sex ratio is 1.069. We are interested in Chinese population. Total of Chinese birth data is 1,813,954 from 1960 to 2017. The count of Chinese baby boy is 939,226 and count of Chinese baby girl is 874,728. The sex ratio of Chinese baby is 1.073. The sex ratio of Chinese baby is higher than the national average. The monthly sex ratio of Chinese baby is in the following.

Singapore Chinese Birth Data 1960-2017
Birth Month	Conception Month	Male	Female	Sex Ratio
January	4	75,194	70,046	1.073
February	5	68,494	64,060	1.069
March	6	76,574	71,732	1.067
April	7	73,949	68,432	1.080
May	8	76,468	70,902	1.078
June	9	75,311	69,788	1.079
July	10	78,164	73,029	1.070
August	11	80,473	74,361	1.082
September	12	82,806	76,848	1.077
October	1	87,976	81,831	1.075
November	2	83,487	78,230	1.067
December	3	80,330	75,469	1.064

The higher sex ratio months are April, May, June and August. Pregnancy lasts for about 280 days or 40 weeks. It's for about 9 months. Therefore, the good conception months for a baby boy are July, August, September, and November in Singapore. This chart is totally different from the Chinese Baby Gender Prediction Chart.

USA Sex Ratio Statistic Survey Data

Let's take at look on the USA sex ratio chart using the US natality data from 2007 to 2017, and then calculated the sex ratio at birth. There are 44,300,538 baby records, 21,631,917 girls and 22,668,621 boys. The sex ratio at birth is 1.0479. We break down it into monthly sex ratio in the following.

US Birth Data 2007-2017
Birth Month	Sex Ratio	Conception Month
Jan	1.0464	April
Feb	1.0463	May
Mar	1.0482	June
Apr	1.0509	July
May	1.0534	August
Jun	1.0538	September
Jul	1.0500	October
Aug	1.0460	November
Sep	1.0458	December
Oct	1.0438	January
Nov	1.0455	February
Dec	1.0445	March

April, May, June, and July have higher sex ratio at birth. Pregnancy needs about 40 weeks or 9 months. The conception months in July, August, September, and October are favorable to have a baby boy in the USA.

According to the sex ratio charts, July, August, September are good months to conceive a baby boy in both Singapore and the USA.

We did the study for United Kingdom sex ratio at birth data. August, September, and October show higher sex ratios in both the United Kingdom and USA charts. We also studied and published a study for Taiwan sex ratio at birth data. August, September, and October are also favorable to conceive baby boys for Taiwanese women. That means autumn is the best season to conceive for a baby boy.

Mother Ages and Chinese Baby Gender Chart

The Chinese Baby Gender Chart shows the women's age is the factor to affect the baby gender. Therefore, we want to check the sex ratio statistic data to see any connection with women's ages.

After studying the US natality data from 2007 to 2017, we didn't find any connection between mother ages and sex ratios in USA. Several other studies have examined the relationship between the age of the mother or father to the birth sex ratio. They said mother age has no statistically significant impact on birth sex ratio. But younger fathers have a higher chance to have male babies.

Recommend Zodiac-Lunar Months for Baby Gender Prediction Chart

Another issue in the Baby Gender Chart is the pregnant month. Most people think the pregnant months should use the Chinese Lunar Calendar. But Chinese Lunar Calendar needs an extra lunar month every three years to synchronize the cycle of the sun. That means Chinese lunar year has 13 lunar months every three years. The Baby Gender Chart doesn't mention the leap months. Some people have a question about we should use the Chinese Zodiac (Stem-Branch) Months instead of the lunar months.

Therefore, we compromise the Chinese Zodiac Months with Chinese Lunar Months into new Zodiac-Lunar Months the following chart. The days of Zodiac-Lunar Months must in both of lunar month and its corresponding Zodiac month. We strongly recommend using Zodiac-Lunar Months for the Chinese Baby Gender Prediction Chart.

Chinese Zodiac-Lunar Months in Singapore Time Zone

China Sex Ratio Survey Data and Chinese Baby Gender Chart

Taiwan Sex Ratio Survey Data and Chinese Baby Gender Chart

Chinese Gender Predictor the for USA