When did China formally end the one-child policy?

The Chinese government announced in late 2015 that the one-child policy would end, and the program was formally concluded in early 2016.12

Following the end of the policy, the government initially allowed all families to have two children. Subsequently, in response to ongoing demographic challenges such as a shrinking workforce and an aging population, the government expanded these limits, allowing couples to have up to three children as of August 2021.1