Old Asian traditions have a preference to sons over daughters usually due to inheritance. As well as this, sons are seen as the primary caregivers for their parents when their parents have grown old, and sons are also preferred due to them being able to do more work for the family and on the family farm.

Because of these reasons, some mothers have gotten more abortions based on the gender of their unborn baby, but since 2005 when it became illegal to get an abortion, mothers and women have taken to backstreet alleys to get an abortion so that their child wont be registered. This increased the mortality rate, and it carries health risks for the mother.This explains how the gender can be skewed in a demographic graph since they will try to have a boy / son no matter the cost.

This in turn leads to another problem. Men cant find enough women to make them their wives... by 2020 there will be 40 million men that cant find a wife in China. This has already lead to increased violence towards women. Many men will not find wives, which means that they will not be able to even have one child, leading to an increased population decrease. China also imposes a major fine / tax for people who have more than 1 child. This is a deterrent for people not to have more than 1 child.

The Chinese government has improved their methods of dealing with illegal and unwanted abortions. Although 40million men might not have wives and might not be able to have children, it does support the "aim" that the policy was meant to accomplish. To limit China's population.

Advantages of the one child policy:

Though there are many problems associated with the gender demographics and critics from other countries, about 76% of chinese support the idea of the one child policy. Many chinese believe that the 400 million births were prevented because of the policy since 1980. They believed that it helped fight against global warming. Fewer people means less demands for energy and lower emissions of heat-trapping gases such as carbon dioxide. Other than that, they thought that the one child policy was a model for others to avert chaotic weather patterns, droughts and other natural disasters such as floods and the rising sea level. It was estimated that China could have emmitted 1.3 billion more tons of carbon dioxide gas per year if the policy was not imposed. The Netherlands Environmental Assessment Agency said China emitted an estimated 6.2 billion tons of gas in 2006, which was blamed for the cause of global warming.

Also, overpopulation restricts the quality of life, so limiting the size of their population could be an advantage to the people. The policy is also not as strict as most people think. Only 36% of the entire population is restricted to one child only. For some families, if you wish for a second or third child, you simply pay a fine. There are loopholes for rural and minority Chinese. For example, the double single loophole. it allows parents who are both the single child of the family to have a second child. The majority of Chinese in their 20s and early 30s now fit into this category.

Disadvantage of the one child policy:

The one child policy prevented 400 million births since it was first introduced in 1978. The problem of the "4-2-1 family" can be seen as a result of the one child policy. The "4-2-1 family" means that one working adult has to support his/ her two parents and grandparents. This puts a massive strain on the working adult.

The policy created instabilities. According to a study by Standford University in 2008, China's gender ratio had grew from 106 male births to 100 female births from 1975 to 120 male births to 100 female births in 2005. This is due to China's cultural imperative for male offspring. Parents do whatever they can to ensure that their one permissible child is a male. Rural areas (villages) suffer from this as they are losing their youths to cities. There is an increase in bachelor villages where the villages are dominated by men that are unlikly to get married.

China's national population and family planning commission have indicated that they will wait till 2015 to revise the one child policy again.