Chinese Baby Gender Prediction Chart Accuracy for USA Women?

This article studies the relationship between sex ratio at Birth (males per females) of United States and the Chinese Baby Gender Prediction Chart to help American women to choose desired gender for their next babies. This involves the usage of Chinese Lunar Calendar. We recommend people to use new Revised Chinese Zodiac-Lunar Months.

Years ago scientists from different countries had researched what might influence the sex ratio at birth. Their studies 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. After reviewing that research data and comparing it with the Chinese baby gender chart, we published an article of Chinese Gender Predictor Chart versus China sex ratio at Birth relationship. We discovered that Chinese Baby Gender Predictor Chart is somewhat accurate but not precise in China. But this doesn't mean the Chinese Baby Gender Predictor Chart is accurate for other countries. Therefore, we want to analyze the birth data of USA sex ratio at birth to see if the Chinese Baby Gender Chart is accurate for USA women.

Many families in the world prefer boy babies. 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 average sex ratio from 1997 to 2017 is about 1.075. The birth data at US Centers for Disease Control (CDC), 1977663 baby boys and 1887091 baby girls born in 2017. The US sex ratio between males and females is 1.048. That indicates that girls like to be born in USA.

Revised USA Zodiac-Lunar Months for Choosing Baby Gender

USA Sex Ratio Statistic Survey Data and Chinese Baby Gender Chart

The National Center for Health Statistics at US Centers for Disease Control (CDC) and Prevention provides good US birth data including, birthplace, birthday, gender, race, mother age and father age. We interest in pregnancy months and baby genders relationships.

We downloaded 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 the monthly sex ratio in the following.

US Birth Data 2007-2017
Month	Sex Ratio
January	1.0464
February	1.0463
March	1.0482
April	1.0509
May	1.0534
June	1.0538
July	1.0500
August	1.0460
September	1.0458
October	1.0438
November	1.0455
December	1.0445

April, May, June and July have higher sex ratios. That means more boys were born in April, May, June, and July in the USA. Pregnancy lasts for about 280 days or 40 weeks, which is about 9 months. The conception months in July, August, September, and October are favorable to have a baby boy.

Compare Chinese Baby Gender Chart

The chart below is the Chinese Baby Gender Statistic Chart. The age in the chart is the woman's Chinese age at conception. The month in the chart is the month of conception. For the gender prediction, blue is the boy and pink is the 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

In order to compare the USA baby birth data, 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

By counting for boy blue box in the Prediction Chart for all month columns, we find that January, February, March, April and September have higher boy counts.

Pregnant months in the spring have a better chance to have a baby boy in China. Pregnant months in the autumn have a better chance to have a baby boy in the USA. This tells us that the Chinese Baby Gender Prediction Chart doesn't work for USA women.

California, New York and Texas Sex Ratio at Birth

The sex ratio of male births per female births varies from country to country. According to the United Nations Statistics Division, the sex ratio at China is 1.15, India is 1.107, Armenia 1.129, Azerbaijan 1.125, and Vietnam is 1.097. The sex ratio at birth in the USA was 1.0479 in 2017. That implies the sex ratios at birth are been affected by geographical regions. Therefore, we want to take a look at the sex ratios at birth in California, New York, and Texas. We simply list out the sex ratios of more than 1.05.

Sex Ratio of CA, NY & TX 2007-2017
State	Month	Sex Ratio
NY	February	1.0521
NY	March	1.0535
CA	April	1.0511
TX	April	1.0504
CA	May	1.0572
TX	May	1.0527
CA	June	1.0599
NY	June	1.0518
TX	June	1.0507
NY	July	1.0641
CA	July	1.0581
CA	December	1.0518

The monthly sex ratios of California, New York and Texas are slight difference. But April, May, June, and July are the common months in three different states. The higher monthly sex ratios at the US west coast, east coast, and south region don't have too much difference.

The Trend of Sex Ratio at Birth

Next, we want to know if monthly sex ratios are the same for the newer generation. The following sex ratios at birth are from 2015-2017. We show only the sex ratios greater than 1.05.

US Sex Ratio Birth Data 2015-2017
Year	Month	Sex Ratio
2017	January	1.0537
2015	March	1.0505
2015	April	1.0562
2015	May	1.0522
2016	May	1.0573
2017	May	1.0581
2015	June	1.0569
2017	June	1.0507
2016	July	1.0516
2015	September	1.0507

May and June are still the higher sex ratio months. Therefore, August and September are months most likely to conceive baby with boy gender.

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.

US Birth Data 2007-2017
Woman Age	Sex Ratio	Woman Age	Sex Ratio
16	1.055	31	1.047
17	1.054	32	1.048
18	1.050	33	1.047
19	1.050	34	1.046
20	1.047	35	1.044
21	1.044	36	1.049
22	1.048	37	1.047
23	1.047	38	1.049
24	1.047	39	1.046
25	1.048	40	1.036
26	1.047	41	1.050
27	1.049	42	1.038
28	1.047	43	1.052
29	1.049	44	1.039
30	1.047	45	1.030

It's obvious that there is no connection between mother ages and sex ratios in the 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 in order 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.

Find Chinese Zodiac-Lunar Months in USA Time Zone

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