The New York Times reports that China is facing a gender imbalance of 32 million among under-20s, because Chinese women often abort female fetuses due to the country's strict one-child policy.
The researchers, who analyzed data from a 2005 census, said the disparity was widest among children ages 1 to 4, a sign that the greatest imbalances among the adult population lie ahead. They also found more distortion in provinces that allow rural couples a second child if the first is a girl, or in cases of hardship.
Those couples were determined to ensure they had at least one son, the researchers noted. Among children born second, there were 143 boys for 100 girls, the data showed.