Related for Ketubot 122:11
<big><strong>גמ׳</strong></big> מ"ט דב"ש גמרי מיולדת נקבה ובית הלל גמרי מיולדת זכר
GEMARA. What is the reason of Bet Shammai? They derive their ruling from [the law relating to] a woman who bears a female child. And Bet Hillel? They derive their ruling from [the law relating to] one who bears a male child.
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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