Boy or girl: gender predictor

Application "Boy or girl?" is useful for definition gender of your future baby using a few approaches.
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Using the app "Boy or Girl: predict the baby's gender" you can more exactly predict the gender of your unborn child. There are a lot of methods of planning the gender of your unborn child: "Chinese Gender Predictor", "Blood renewal", "Japanese method", "By parents' blood types", etc.
What approaches does this application consist?

1. Blood renewal. It is believed that the blood of a man is refreshed during every fourth year of his life, and a woman’s on every third. At the time of conception, the person whose blood is younger (dad or mum) determines the sex of a baby.

2. By parents' blood types. People have little marker things called antigens on the surface of their red blood cells. The two most important ones are ABO system antigens and the Rh system. The combination of parents' blood types defines the possibility of birth children with different gender.

3. Chinese Gender Predictor. This approach uses information about age of future mother and when she got pregnant. Legend says the chart is more than 700 years old and was discovered in a royal tomb.

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