Huang Yuxian, an 8-month-old boy who was trafficked from Guangdong to a small village in Central China's Henan province, was rescued. His mother held him tightly in her arms at the airport in Guangzhou on Sunday. Provided by Yangcheng Evening News. [Photo/CFP]

China introduced a DNA information system solely for child-trafficking cases in 2009. It has been used to identify parent-child relationships by comparing samples collected from families of missing children. "(As of October), it has helped find more than 3,500 kidnapped children," Chen Shiqu said.

More efforts have been introduced to save abducted children. On Nov 3, an online platform was launched in Beijing to construct a database for parents, children, the police and the public at large to share related information.

Wu Yan, Liu Jing, Ma Chi and He Shuang contributed to this report.