After more than 30 years of the one-child policy, China started to face population aging problem. And as Chinese economy developed rapidly in recent years, work force also became tight. In 2015, it was decided that the one-child policy was to be removed, and instead allowed couples to have two children for the first time in thirty years. Effective from January 2016, the one-child policy was replaced by a two-child policy, allowing each couple to have two children. 