Proposed incentives for couples to have a second baby—including tax breaks and extra maternity leave—won’t lead to a significant spike in China’s birth rate, a renowned demographer said.

Liang Zhongtang’s comments come amid growing concerns about the nation’s aging population, and government discussions on correcting the problem.

Enticements were proposed in Beijing this month at the National People’s Congress and a coinciding gathering of top government advisers as a way to ease the financial burden for couples who decide to have a second child.