Bekhorot 19 elsewhere in Shas

Bekhorot 47b:14-15: Similarly, the second son who follows him is not considered the firstborn with regard to inheritance, as we require fulfillment of the verse: “For he is the first of his strength, the right of the firstborn is his” (Deuteronomy 21:17), and
Niddah 32a:1-4: The Gemara responds: It is Rabbi Meir, as it is taught in a baraita: A minor boy and a minor girl may not perform the ritual through which a yavam frees a yevama of her levirate bonds [ḥalitza], nor may they enter into levirate marriage.
Yevamot 61b:5-6: The Gemara challenges Rabba’s explanation: And does Rabbi Eliezer hold in accordance with the opinion of Rabbi Meir?
Yevamot 119a:5-8: Shall we say that the mishna follows the opinion of Rabbi Meir, who is concerned about the minority?
Niddah 25a:13-14: Rava raised an objection to the opinion of Rav Naḥman from a mishna that specifies the obligations that apply to firstborn animals (Bekhorot 19b):But the Sages said that not only does a viable offspring exempt any subsequent offspring from