Related for Ketubot 122:12
וב"ה נמי נגמרו מיולדת נקבה אי מיולדת גמרי לה הכי נמי אלא ב"ה מנדה גמרי לה
Why doesn’t Bet Hillel also derive their ruling from [the law relating to] a woman who bears a female child? If they had derived their ruling from [the law relating to] a woman who bears a child they should indeed have ruled thus. Rather, Bet Hillel derive their ruling from [the law of] the menstruant.
Tosefta Ketubot
One who vows from having sex with his wife, Beit Shammai say: [They can remain married] for 2 weeks, like the [period of impurity after the] birth of a female; Beit Hillel say: 1 week, like the birth of a male and like her menstrual period. More than that—he divorces her and pays the ketubah.
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