וְאִם־נְקֵבָ֣ה תֵלֵ֔ד וְטָמְאָ֥ה שְׁבֻעַ֖יִם כְּנִדָּתָ֑הּ וְשִׁשִּׁ֥ים יוֹם֙ וְשֵׁ֣שֶׁת יָמִ֔ים תֵּשֵׁ֖ב עַל־דְּמֵ֥י טָהֳרָֽה׃
若她生了女孩，就不潔淨兩個七天，如同她月經期間的不潔淨一樣；她要在潔淨之血的期間等候六十六天。
Niddah
The students of Rabbi Shimon ben Yohi asked: Why does the Torah say a new mother should bring sacrifice? He answered: When she is giving birth—lit. in the hour when she is kneeling in childbirth—she swears not to have intercourse with her husband Therefore, the Torah prescribes she bring sacrifice.