Pidyon Haben is a rite of passage in Judaism that is known as 'the redemption of the first born son'. It takes place when a baby is at least 31 days old, and involves 'buying him back from a Cohen.' Here the baby is draped in gold by the mother, grandmother and family and then bought back from a Cohen for 5 pieces of silver. The baby has to be the first boy who has opened his mother's womb and not have been delivered by a caesarean birth.