Originally, the Jewish firstborn were consecrated as priests. They were selected for priestly work when God saved them from the Plague of the Death of the Firstborn in Egypt. However, when the Jews, including the firstborn, served the Golden Calf, God diminished their status. The priesthood was transferred to the tribe that did not partake of the Golden Calf, the tribe of Levi, specifically to the sons of Aaron.
Desde ese momento en adelante, todos los primogénitos judíos deben ser redimidos de un descendiente de Aarón en una ceremonia llamada pidión haBen – la redención del hijo.
Only firstborn children of their mothers must be redeemed, except if one of the parents is a Cohen or Levi, or babies born by cesarean section.
Ideally, the ceremony takes place on the thirty-first day of the baby's life. If this doesn't happen, it should be done as soon as possible. If the parents don't redeem their child, he must do it himself when he becomes an adult.
The redemption price is five shekels, approximately 100 grams of silver. The ceremony is usually performed during a festive meal.
To give you an idea, today there are 70 U$S.
The Cohen who receives it customarily donates it immediately to tzedakah.
The metal silver is needed; at 96 it would be 106 grams, at 90 it would be 110 grams.
How would shalom be done today? Without a temple or a Kohen!