I found something very interesting

Beijing, Shanghai, and Guangdong and Fujian have completely two different child-rearing logics.
The Beijing and Shanghai model is to support a child with the whole family’s strength, using all the family’s resources on this one child.
While the Guangdong and Fujian model is to have more children, four or five, and rely on probabilistic advantage—if one of them happens to be talented, then naturally they can succeed.