50th-day celebration after a child's birth
Traditional Japanese custom of celebrating 50 days after a baby is born. Often involves a visit to a shrine and a family gathering.
See also: 五十日 (いか)
For the 50th-day celebration, we take the baby to visit a shrine.
五十日 refers to the 50th day itself, while 五十日の祝 is the celebration held on that day.
Compound of 五十日 (いか, '50th day') and 祝 (いわい, 'celebration'). The reading いか for 五十日 is an older native Japanese reading.