Fig. 1From: Association of China’s two-child policy with changes in number of births and birth defects rate, 2008–2017The number of monthly births in Pudong New Area, Shanghai. There were three policy periods: the one-child policy period (Jan 2008 - Nov 2014), the partial two-child policy period (Dec 2014 - Jun 2016), and the universal two-child policy period (Jul 2016 - Dec 2017). Policy was assumed to take effect about nine months after the announcementBack to article page