After World War II it was changed to celebrate the health and growth of all children, in hopes of uplifting the spirits of Japan.

Families hoist Koinobori (cloth carp streamers). These can range in size from a few feet to several meters in length. Koinobori are believed to be strong, spirited fish that are known for their determination in fighting up streams and through powerful waterfalls. Some are hung off balconies and others are hoisted up on huge flag poles. It is also a part of Golden Week.

Gogatsu-Ningyo (Dolls for boys) are put on display in homes. The dolls are patterned after samurai warriors and heroes, and their armaments, such as Kintaro, Momotaro and others that symbolize courage.

Some families also display a Kabuto (samurai helmet). To drive away bad spirits and celebrate the future of their sons. 

Iris flowers bloom during this time, and are placed in the home to ward off evil. Some families still practice the ancient practice of taking a Syobuyu (a bath with floating iris leaves). This is said to have medicinal values.

Families also eat Kashiwa-Mochi (a rice cake stuffed with bean paste and wrapped with oak leaves) and Chimaki (a dumpling wrapped in bamboo leaves).