As South Korea scrambles to halt the sharp decline in its birth rate, policymakers are having a hard time convincing many in their 20s and 30s that parenthood is a better investment than stylish clothes or fancy restaurants.

Asia's fourth-largest economy plans to launch a new government ministry dedicated to demographic challenges after years of incentives failed to ease the baby crisis.

But for Park Yeon, a 28-year-old fashion Instagrammer and aspiring singer, spending choices are guided mostly by her appetites for clothing and travel, leaving little budget for marriage and babies.