Since its implementation, it is estimated the policy has resulted in a reduction of some 400 million people in China.
However, the policy has also been blamed for generating a number of social problems.
China's labor force, at about 940 million, decreased by 3.45 million year on year in 2012, marking the first "absolute decrease." The labor force is estimated to decrease by about 29 million over the current decade.
Meanwhile, the country's growing elderly population aged 60 and over, which accounted for 14.3 percent of the total currently, is forecast to exceed one third of the population in 2050.
Gender imbalance is another side effect of the one-child policy. Chinese parents' preference for sons led to the abortion of female foetuses due to the policy.
About 118 boys are born for every 100 girls in 2012, higher than the normal ratio of 103 to 107 boys for every 100 girls. Millions of Chinese men will be unable to find wives in 2030.
Economists say the one-child policy is also a cause for the high savings rate among Chinese people.
"The change in the family planning policy will certainly affect China's one-child generation -- some of whom have already become parents. It will help them enjoy a better future," wrote an Internet user called herself "shanma123."
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