Delegates to China's parliament are urging the overhaul or even scrapping of controversial family planning rules and say radical steps are needed to "liberate fertility" and reverse a decline in births and a rapidly shrinking workforce.

With its population aging as a result of longer lifespans and a dwindling number of children, the world's most populous nation decided in 2016 to allow all couples to have a second child, relaxing a tough one-child policy in place since 1978.

But birth rates plummeted for the second consecutive year last year. Policymakers now fret about the impact a long-term decline in births will have on the economy and its strained health and social services.