His study also found the policy helped balance the gender ratio.
In 2010, the ratio for children age 1 to 4 was 110 boys for every 100 girls in Enshi, lower than in Hubei province, which was 124 boys for every 100 girls.
The ratio in Chengde and Jiuquan in 2010 - 114 boys for every 100 girls - was also significantly lower than other provincial areas, Yi said.
One of the major problems brought about by the one-child policy is the imbalance of sex ratio at birth, as the 2010 national census showed China has 118 boys born to every 100 girls.
However, Yi warned that the two-child policy could not provide a fundamental solution to the imbalance in sex ratio, even though selective abortions would be reduced greatly.
"If couples were only allowed to have one child, half of all families would give birth to boys. If they were allowed to have two, three quarters of families would get at least one boy," he said. "There would be much less motivation for selective abortion.
"Compared with the one-child policy, allowing couples to have two children would reduce the sex ratio at birth. However, there is still the problem of an imbalance in sex ratio, as the experiment indicated."
About the broadcaster:
Nelly Min is an editor at China Daily with more than 10 years of experience as a newspaper editor and photographer. She has worked at major newspapers in the U.S., including the Los Angeles Times and the Detroit Free Press. She is also fluent in Korean.
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