Circumcision
Circumcision is very important to most branches of Judaism, with over 90% of male adherents having the procedure performed as a religious obligation. The basis for its observance is found in the Torah of the Hebrew Bible, in Genesis chapter 17, in which a covenant of circumcision is made with Abraham and his descendants. Jewish circumcision is part of the "brit milah" ritual, to be performed by a specialist ritual circumciser, a "mohel", on the eighth day of a newborn son's life, with certain exceptions for poor health. Jewish law requires that the circumcision leaves the glans bare when the penis is flaccid. Converts to Conservative and Orthodox Judaism must also be circumcised; those who are already circumcised undergo a symbolic circumcision ritual. Circumcision is not required by Judaism for one to be considered Jewish, but some adherents foresee serious negative spiritual consequences if it is neglected.
Adult bar and bat mitzvah
An adult bar/bat mitzvah is a bar or bat mitzvah of a person older than the customary age. Traditionally, a bar or bat mitzvah occurs at age 13 and 12 for boys and girls respectively. However, many adult Jews who have never had a bar or bat mitzvah choose to have one later in life, and many who have had one at the traditional age choose to have a second. An adult bar or bat mitzvah can be held at any age after adulthood is reached and can be performed in a variety of ways.