Bekhorot 47 elsewhere in Shas

Yevamot 100a:14: MISHNA: With regard to a woman who did not wait three months after separating from her husband, and remarried and gave birth to a son, and it is not known if he was born after nine months of pregnancy to the former husband or if he was born
Yevamot 62a:10: The Gemara comments: And they follow their regular line of reasoning, as it was stated: If one had children when he was a gentile and he subsequently converted, Rabbi Yoḥanan said: He does not have a firstborn with regard to inheritance, i.
Yevamot 91a:2: The Gemara asks: And a daughter of a Levite, is she disqualified from partaking of the tithe by licentiousness?
Yevamot 62a:9: § It was stated that amora’im disagreed over the following issue: If a man had children when he was a gentile and he subsequently converted, Rabbi Yoḥanan said: He has already fulfilled the mitzva to be fruitful and multiply, and Reish Laki
Keritot 7b:11: These women do not bring a sin offering: A woman who miscarries an amniotic sac full of water, or one full of blood, or one full of different colors; and likewise a woman who miscarries a fetus with a form similar to fish, or grasshoppers,
Bava Batra 127a:11: Rav Pappa subsequently said to Rava: But didn’t Ravin send a letter from Eretz Yisrael to Babylonia, stating: I asked all my teachers about this matter and they did not tell me anything; but this is what they said in the name of Rabbi Yanna
Bekhorot 19a:6-7: The Gemara analyzes the baraita.