Yevamot 71B

מעת לעת.

that during the recovery period one must wait from the time the 7 days began to the exact same time 7 days later, i.e., 7 complete 24-hour periods. Therefore, if the child recovered in the afternoon of a particular day, one is required to wait until that same time of day a week later, and only then is he circumcised.

והתני לודאה: יום הבראתו כיום הולדו. מאי לאו: מה יום הולדו לא בעינן מעת לעת, אף יום הבראתו לא בעינן מעת לעת?

The Talmud asks: Didn’t the Sage from Lod teach that the day of his healing is like the day of his birth? What, is it not that just as with regard to the day of his birth we need not wait from the time he is born to the same time on the 8th day to circumcise him, so too, with regard to the day of his healing we need not wait from the time he heals to the same time 7 days later?

לא, עדיף יום הבראתו מיום הולדו. דאילו יום הולדו לא בעינן מעת לעת, ואילו יום הבראתו בעינן מעת לעת.

The Talmud refutes this argument: No, the day of his healing is superior to the day of his birth: While from the day of his birth until circumcision we need not wait from the time he is born to the same time on the 8th day to circumcise him, i.e., the child may be circumcised already at the start of the 8th day, from the day of his healing we need to wait 7 complete days from the time he heals to the same time 7 days later.

רב פפא אמר: כגון דכאיב ליה עיניה לינוקא ואיתפח ביני וביני.

The Talmud suggests other circumstances where a male child may be present at the time of the eating of the Paschal lamb but absent at the time of its preparation. Rav Pappa said: This would take place, For example: if the baby’s eye hurt him on the 8th day following his birth, which occurred on the eve of Passover, and he recovered in the meantime between the time of the preparation of the Paschal lamb and the time of its eating. In the case of a minor ailment such as eye pain, circumcision is not performed as long as the pain persists, but it may be performed as soon as the child has recovered, without first waiting 7 days.