An infant may be circumcised [either] on the eight, ninth, tenth, eleventh, or twelfth [day], not earlier not later. How is this? In the normal course, [he is circumcised] on the eight; if he was born at twilight, he is circumcised on the ninth; [if he was born] at twilight on the eve of the Sabbath, he is circumcised on the tenth; [if] a festival [falls] after the Sabbath, he is circumcised on the eleventh; [in the case of] the two festival days of Rosh Hashanah, he is circumcised on the twelfth. A sick infant, we may not circumcise him until he recovers.

These are the shreds that invalidate the circumcision: flesh that covers the larger part of the corona. And he may not eat of terumah. If he was fleshy, he must rectify it for appearances’ sake. If he circumcised but did not expose the circumcision, it is as if he did not circumcise.