Children attend the World Skiing Day activity in a resort in Chongli County of Zhangjiakou, north China's Hebei Province, on Jan. 18, 2015. About 17.23 million babies were born in 2017, of which 51 percent have an older sibling, according to the National Health and Family Planning Commission. However, the total number of births fell by about 630,000 compared with 2016 while percentage of the population aged over 60 rose from 16.7 percent in 2016 to 17.3 percent in 2017. (Xinhua)