Conclusion. The Chinese birth calendar claims 93-99% accuracy in predicting infant gender based on month of conception and maternal age at delivery. In this large delivery dataset, accurate prediction of fetal gender based on the Chinese birth calendar was no better than a coin toss.
But how accurate are they, really? Some claim that using a Chinese gender calendar can be up to 93 percent accurate in predicting your baby's sex. And because it's based on your age and the month you conceived, you can consult the chart at any point during your pregnancy.
Science has been unable to verify the accuracy of the Chinese birth chart, so be careful using the chart solely to determine or predict the gender of your child. There are several ways to scientifically predict the gender of your unborn baby — ultrasound, amniocentesis — but the Chinese birth chart is not one of them.
There's no scientific evidence that the Chinese gender predictor works. But since there are only two choices – boy or girl – it has at least a 50-50 chance of making an accurate prediction!
The box where your lunar age and your baby's lunar conception month meet is the gender prediction for the baby. If the box is blue, it's a boy. If the box is pink, it's a girl.
Nature is designed to favour the conception of boys from September to November and girls from March to May because of an evolutionary mechanism aimed at keeping the overall sex ratio as near to 50:50 as possible, the scientists said.
How to tell what gender you're having? The most accurate way to know if you're having a boy or girl is an ultrasound, often done at around 20 weeks.
Gender predictions made by ultrasound have an accuracy rate "north of 90 percent," Carr said.
It takes 49 as the base, plus the lunar month of conception, minus the lunar age at conception. If the result is an odd number, it should be a boy; otherwise it is a girl. For example, someone is 31 lunar years old and got pregnant in lunar January, 49+1-31=19, so she should be conceiving a baby boy.
Conception usually occurs around 11-21 days after the first day of the last period of a woman who has a regular period. The estimation of conception date is based on this, but is rarely ever exact since it is difficult to know exactly when ovulation occurs.
There has always been a misunderstanding that the Chinese Gender Chart changes every year. The fact is that there is only one gender chart, which was invented in the Qing dynasty. It is used for both gender prediction and selection.
Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).
The age where a man is most fertile is between 22 and 25 years. It is suggested to have children before the age of 35. After this age, the male fertility begins to worsen. After 35, the sperm might result in pregnancies where mutations can occur.
For a girl, a couple should have sex two or three days before ovulation or on the day of ovulation to increase their odds of having a girl. According to Whelan, the success rate of having a girl with this method is 57 percent.
On an average, couples have sex 78 times from the time they start trying to the time they get a positive result. These 78 times are spread over 158 days or about 6 months. A study surveyed 1,194 parents and found that most couples have sex 13 times a month while they are trying to conceive.
Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl. What we can say is that dad's sperm determines whether a baby will be born as a boy or a girl. About half of his sperm will make a boy and half a girl.
Although various methods suggest things we can do to conceive either a boy or girl, gender selection is ultimately determined by the sperm that reaches the egg. Once fertilization has occurred, the sex of the baby has been decided.
It has been researched that parents favouring baby boys in China has stemmed from the Confucian tradition which has imbedded ideologies of the roles and importance of females and males in Chinese society for more than 2000 years.