祝

celebration held 50 days after the birth of a child

60th birthday celebration (usu. celebrated with a banquet-style meal while dressed in a red hat and vest symbolizing one's return to infancy)

childbirth bonus (paid to an employee); congratulatory childbirth payment

Historical term

traditional Koshōgatsu ceremony where the newly-wed wife is hit on the rump with a sacred wooden pole to ensure her fertility