A brit is performed on the eighth day following the birth of the child. If he was born before the twilight period, then the day on which he was born is included in the eight days. If he was born after the twilight period, the next day begins the eight-day counting.

A circumcision carried out prior to the eighth day is invalid.

A brit that had been postponed until after the eighth day, for any reason whatsoever, may not take place on Shabbat or Jewish Holidays. Only the brit of a baby born by normal delivery overrides Shabbat or Holidays. Therefore, a child born by Caesarian section may not have his brit performed on Shabbat or Holidays. (In such an instance, it would be postponed until Sunday.)

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