Talmud do Sota 4:4

If there was ḥalîṣah during these three months, does she need another one after three months? Let us hear from the following⁹Mishnah 12:5.: “A minor who performed ḥalîṣah should perform ḥalîṣah after she grows up; if she performed [only one] ḥalîṣah, the ḥalîṣah she performed is valid¹⁰In a plurality of mss. of the Babylonian Mishnah, “not valid”. A minor cannot perform acts that are legally valid, but the essence of ḥalîṣah is the declaration of the levir, by necessity an adult, that he refuses to marry the widow..” Rebbi Mana said it anonymously, Rebbi Isaac the son of Rebbi Ḥiyya brought it in the name of Rebbi Joḥanan¹¹In the parallel in Chapter 12, R. Jonah instead of R. Joḥanan.; this is Rebbi Meïr‘s, since Rebbi Meïr says one does neither perform ḥalîṣah nor levirate with a minor: maybe she would turn out to be a she-ram¹²R. Meïr is known in many cases to require attention to possibilities that are seldom realities. For a she-ram, levirate is forbidden and ḥalîṣah unnecessary. The same argument in Babli Bekhorot 19b; a detailed discussion in Tosaphot ad. loc., s. v. איש.. As you say there, even though she already performed ḥalîṣah, she again performs ḥalîṣah; so here also though she did perform ḥalîṣah, she performs ḥalîṣah¹³If ḥalîṣah was performed early, against the rules, it has to be performed again after the three months have passed but, in case this was not done, the first ḥalîṣah is valid..

It was stated¹⁴⁷Tosephta Niddah 2:3, Babli 60a. In both these texts, one reads: If he stopped after24months, one does not return him. A parallel text in Yerushalmi Niddah 1:5, with a different tradition of names.: A baby suckles continuously until 24 months; after that he is as if an unclean creature would suckle, the words of Rebbi Eliezer. But Rebbi Joshua says, he suckles continuously even four or five years. If he stopped, one does not return him. How long? Rebbi Jacob bar Aḥa, Rebbi Jeremiah¹⁴⁸This reading is impossible since R. Jacob bar Aḥa is one generation before R. Jeremiah. One must read “Rav Jeremiah”, the colleague and student of Rav. in the name of Rav: From hour to hour¹⁴⁹From a certain hour one day to the same hour the next day, i. e., 24 hours.. Rebbi Ḥizqiah, Rebbi Abbahu in the name of Rebbi Joshua ben Levi: Three days from hour to hour¹⁵⁰In the Babli, 60a, this is attributed to the school of Samuel.. It was stated: From hour to hour. Rebbi Hizqiyah, Rav: When has this been said? If he stopped while being healthy. But if he stopped because of sickness, one does return him. When there was no danger. But if it was because of danger, one returns him even after a number of days¹⁵¹This argument is not mentioned in the Babli which, therefore, can be
assumed to agree..