National Only Child Day is observed worldwide every April 12 to celebrate individuals who have no siblings and to dispel negative stereotypes associated with being an only child. The holiday aims to eliminate misconceptions that only children are spoiled or socially inept, a notion popularized by psychologist Granville Stanley Hall in the late 19th century. Although the origins of National Only Child Day are unclear, it has been recognized since at least 2015, with some sources suggesting it began in 2010. Celebrations may include showing appreciation to parents, connecting with other only children, enjoying media featuring only child characters, and sharing personal experiences on social media using the hashtag #NationalOnlyChildDay. As the number of families with only one child continues to rise, the hope is that the stigma surrounding only children will diminish over time.