Finally, even though the father of the child may not break his fast when the ninth of Av is on the thirty-first day of the birth of the firstborn, some authorities hold that when the thirty-first day of the birth occurs on a Tisha B’Av that was postponed to the tenth of Av (as is the case when the ninth of Av is on a Shabbat), the father of the child and the kohen may break their fast in the afternoon, even though they may not make a seudat mitzvah.
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