Study Yevamot folio 12B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
And the halakha is that the rival wife of an aylonit is permitted, and this is the case even if her first husband knew of her status and her marriage was fully valid. The mitzva of levirate marriage does not apply to an aylonit, but her rival wife is not forbidden. And even in the case of the rival
The Talmud asks: However, with regard to that which the Mishnah teaches: Were found to be, from which it was inferred that there is a difference between an aylonit whose condition was known by the husband beforehand and one who was recognized by him only later, how is this to be explained? The Tal
§ Incidental to the case of refusal, the Talmud cites a related halakha. Rav Beivai taught a baraita before Rav Naḥman: 3 women may engage in sex with a contraceptive resorbent, a soft fabric placed at the entrance to their wombs to prevent conception, despite the fact that this practice is general
And the baraita continues: Who is considered a minor? It is a girl from the age of 11 years and one day until the age of 12 years and one day. If she was younger than this or older than this, she may go ahead and engage in sex in her usual manner. This is the statement of R' Meir. Since it is as
The Talmud analyzes the baraita: From the fact that the baraita states: Lest she become pregnant and perhaps die, this indicates by inference that there is a minor who can become pregnant and will not die, although the conditions for this scenario of a minor giving birth and surviving are unclear.