Source Sheet for Mishnayos Mesechtas Chullin Part 4

This source sheet is part of a series of source sheets providing background for Mishnayos Chullin. The series can be found here.

Chapter 4

The fourth Perek of Messeches Chullin focuses on the status of an unborn fetus and its relationship to its mother. Does it have an existence separate from its mother or is it considered simply an extension of, and part of, the mother itself? This has implications for a variety of Halachos, including whether the Schechitah of the mother works to similarly permit eating the unborn fetus. The Mishnah addresses variations of this theme as well as implications for the rule of the Bechor and Tumah and Taharah.

Sources for Mishnah 4:1

Our Mishnah teaches that once an animals head emerges from the birth canal it is considered sufficiently "living" that it no longer can be permitted by virtue of its mother's Schechitah. We find a similar idea, (Bechoros 8:1) that the emergence of the baby's head, will determine the status for both inheritance and Pidyon HaBen.

(א) יֵשׁ בְּכוֹר לַנַּחֲלָה וְאֵינוֹ בְכוֹר לַכֹּהֵן, בְּכוֹר לַכֹּהֵן וְאֵינוֹ בְכוֹר לַנַּחֲלָה, בְּכוֹר לַנַּחֲלָה וְלַכֹּהֵן, יֵשׁ שֶׁאֵינוֹ בְכוֹר לֹא לַנַּחֲלָה וְלֹא לַכֹּהֵן. אֵיזֶהוּ בְּכוֹר לַנַּחֲלָה וְאֵינוֹ בְכוֹר לַכֹּהֵן, הַבָּא אַחַר הַנְּפָלִים שֶׁיָּצָא רֹאשׁוֹ חַי, וּבֶן תִּשְׁעָה שֶׁיָּצָא רֹאשׁוֹ מֵת, וְהַמַּפֶּלֶת כְּמִין בְּהֵמָה חַיָּה וָעוֹף, דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים אוֹמְרִים, עַד שֶׁיְּהֵא בוֹ מִצּוּרַת הָאָדָם. הַמַּפֶּלֶת סַנְדָּל, אוֹ שִׁלְיָא, וּשְׁפִיר מְרֻקָּם, וְהַיּוֹצֵא מְחֻתָּךְ, הַבָּא אַחֲרֵיהֶן, בְּכוֹר לַנַּחֲלָה וְאֵינוֹ בְכוֹר לַכֹּהֵן. מִי שֶׁלֹּא הָיוּ לוֹ בָנִים וְנָשָׂא אִשָּׁה שֶׁכְּבָר יָלְדָה, עוֹדָהּ שִׁפְחָה וְנִשְׁתַּחְרְרָה, עוֹדָהּ נָכְרִית וְנִתְגַּיְּרָה, מִשֶּׁבָּאת לְיִשְׁרָאֵל יָלְדָה, בְּכוֹר לַנַּחֲלָה וְאֵינוֹ בְכוֹר לַכֹּהֵן. רַבִּי יוֹסֵי הַגְּלִילִי אוֹמֵר, בְּכוֹר לַנַּחֲלָה וְלַכֹּהֵן, שֶׁנֶּאֱמַר (שמות יג), פֶּטֶר כָּל רֶחֶם בִּבְנֵי יִשְׂרָאֵל, עַד שֶׁיִּפְטְרוּ רֶחֶם מִיִּשְׂרָאֵל. מִי שֶׁהָיוּ לוֹ בָנִים וְנָשָׂא אִשָּׁה שֶׁלֹא יָלְדָה, נִתְגַּיְּרָה מְעֻבֶּרֶת, נִשְׁתַּחְרְרָה מְעֻבֶּרֶת, יָלְדָה הִיא וְכֹהֶנֶת, הִיא וּלְוִיָּה, הִיא וְאִשָּׁה שֶׁכְּבָר יָלְדָה, וְכֵן מִי שֶׁלֹּא שָׁהֲתָה אַחַר בַּעְלָהּ שְׁלשָׁה חֳדָשִׁים וְנִשֵּׂאת וְיָלְדָה, וְאֵין יָדוּעַ אִם בֶּן תִּשְׁעָה לָרִאשׁוֹן, אוֹ בֶן שִׁבְעָה לָאַחֲרוֹן, בְּכוֹר לַכֹּהֵן וְאֵינוֹ בְכוֹר לַנַּחֲלָה. אֵיזֶהוּ בְּכוֹר לַנַּחֲלָה וְלַכֹּהֵן, הַמַּפֶּלֶת שְׁפִיר מָלֵא דָם, מָלֵא מַיִם, מָלֵא גְנִינִים, הַמַּפֶּלֶת כְּמִין דָּגִים וַחֲגָבִים שְׁקָצִים וּרְמָשִׂים, הַמַּפֶּלֶת יוֹם אַרְבָּעִים, הַבָּא אַחֲרֵיהֶן, בְּכוֹר לַנַּחֲלָה וְלַכֹּהֵן:

(1) There is one who is [counted as] a firstborn [with respect to] inheritance but not with respect to redemption from a priest; a firstborn with respect to redemption from a priest but not a firstborn [with respect] to inheritance; a firstborn [with respect to both] inheritance and redemption from a priest; and a firstborn [in respect] to neither inheritance nor redemption from a priest. Which is a firstborn [with respect] to inheritance but not to redemption from a priest? One which follows one which was not viable whose head came forth alive, or one born in the ninth month whose head came out dead, or when a woman aborts something that looks like an animal, beast or bird, the words of Rabbi Meir. But the sages say: [it is not considered an opening of the womb] until [the abortion] has the form of a human being. If [a woman] aborts a sandal or a placenta or a fetus having an articulated shape, or if an embryo came out by pieces, [the infant] which follows after them is a first-born [with respect] to inheritance but not a first-born for redemption from a priest. If one who never had children married a woman who had already given birth, even if she had given birth when she was a slave but is now free, or [had given birth] when she was a non-Jew but has since converted, if after coming to the Israelite she gave birth, [the infant] is considered a first-born [with respect] to inheritance but not a first-born for redemption from a priest. Rabbi Yose the Galilean says: [the infant] is a firstborn [with respect] to inheritance and for redemption from a priest, as it says: “Whatever opens the womb in Israel” (Exodus 13:2), meaning only if it opens the womb in Israel. If one had children already and married a woman who had never given birth previously Or if she converted when pregnant, or if she was freed when pregnant, and she gave birth; If she and a priestess gave birth, she and a Levite’s daughter, she and a woman who had already given birth; And similarly [if a woman] who did not wait three months after her husband's death, married and gave birth and it is not known if the infant was born in the ninth month since the death of the first [husband] or in the seventh month since she married the second, it is a firstborn for redemption from a priest but not a first-born [with respect] to inheritance. Which is a firstborn both [in respect] of inheritance and for redemption from a priest? If [a woman] miscarries a sac full of blood or full of water or full of pieces of flesh; or if [a woman] miscarries something with the shape of fish or locusts or reptiles, or creeping things, or if she discharges on the fortieth day [of conception], [the infant] which follows after [these discharges] is a firstborn both [in respect] of inheritance and for redemption from a priest.

Sources for Mishnah 4:2

Our Mishnah rules that in certain situations, you must bury the fetus as it is wholly prohibited, and you cannot sell/feed it to a non-Jew. (see Temurah 7:3). This implies that he cannot sell the dead Bechor to a non-Jew. This is confirmed by the Mishnah in Zevachim (12:4) which implies that he meat of the Bechor is likeise prohibited and must be buried.

The question then is why in Bechoros 5:2 does Beis Hillel allow a non-Jew to eat alongside the Koehin a Blemished Bechor? One would then think that a non-Jew should always be permitted to eat an invalid Bechor. See Tosfos ad loc.

(ג) אֶחָד קָדְשֵׁי מִזְבֵּחַ וְאֶחָד קָדְשֵׁי בֶדֶק הַבַּיִת, אֵין מְשַׁנִּין אוֹתָן מִקְּדֻשָּׁה לִקְדֻשָּׁה, וּמַקְדִּישִׁין אוֹתָן הֶקְדֵּשׁ עִלּוּי, וּמַחֲרִימִין אוֹתָן. וְאִם מֵתוּ, יִקָּבְרוּ. רַבִּי שִׁמְעוֹן אוֹמֵר, קָדְשֵׁי בֶדֶק הַבַּיִת, אִם מֵתוּ, יִפָּדוּ:

(3) Both dedications for the altar and dedications for the repairs of the Temple may not be changed from one holiness to another. One may dedicate them with a value-dedication, and one may conscribe them. If they die, they are buried. Rabbi Shimon says: dedications for the repairs of the temple, if they died, they are redeemed.

(ב) בֵית שַׁמַּאי אוֹמְרִים, לֹא יִמָּנָה יִשְׂרָאֵל עִם הַכֹּהֵן עַל הַבְּכוֹר. בֵּית הִלֵּל מַתִּירִין, וַאֲפִלּוּ נָכְרִי. בְּכוֹר שֶׁאֲחָזוֹ דָם, אֲפִלּוּ הוּא מֵת, אֵין מַקִּיזִין לוֹ דָם, דִּבְרֵי רַבִּי יְהוּדָה. וַחֲכָמִים אוֹמְרִים, יַקִּיז, וּבִלְבַד שֶׁלֹּא יַעֲשֶׂה בוֹ מוּם. וְאִם עָשָׂה בוֹ מוּם, הֲרֵי זֶה לֹא יִשָּׁחֵט עָלָיו. רַבִּי שִׁמְעוֹן אוֹמֵר יַקִּיז, אַף עַל פִּי שֶׁהוּא עוֹשֶׂה בוֹ מוּם:

(2) Bet Shammai says: An Israelite must not be invited to share [a blemished first born] with a priest. But Bet Hillel permits this, even in the case of a non-Jew. If a first born has a blood attack, even if it is going to die, its blood may not be let, the words of Rabbi Judah. But the sages say: he may let its blood, as long as he does not make a blemish. And if he made a blemish, he must not slaughter it on account of this. Rabbi Shimon says: he may let blood, even though he makes a blemish.

(ד) כָּל הַקֳּדָשִׁים שֶׁאֵרַע בָּהֶם פְּסוּל קֹדֶם לְהֶפְשֵׁטָן, אֵין עוֹרוֹתֵיהֶם לַכֹּהֲנִים. לְאַחַר הֶפְשֵׁטָן, עוֹרוֹתֵיהֶם לַכֹּהֲנִים. אָמַר רַבִּי חֲנִינָא סְגָן הַכֹּהֲנִים, מִיָּמַי לֹא רָאִיתִי עוֹר יוֹצֵא לְבֵית הַשְּׂרֵפָה. אָמַר רַבִּי עֲקִיבָא, מִדְּבָרָיו לָמַדְנוּ, שֶׁהַמַּפְשִׁיט אֶת הַבְּכוֹר וְנִמְצָא טְרֵפָה, שֶׁיֵּאוֹתוּ הַכֹּהֲנִים בְּעוֹרוֹ. וַחֲכָמִים אוֹמְרִים, אֵין לֹא רָאִינוּ רְאָיָה, אֶלָּא יוֹצֵא לְבֵית הַשְּׂרֵפָה:

(4) All sacrifices which became disqualified, before they were flayed, their hides do not belong to the priests. After they were flayed, their hides belong to the priests. Rabbi Hanina vice-chief of the priests said: Never in my life have I seen a hide go out to the place of burning. Rabbi Akiva said: we learn from his words that if one flays a firstling and it is found to be terefah, the priests have a right to its hide. But the sages say: “I have never seen” is not proof: rather, it [the hide] must go forth to the place of burning.

Similar to our Mishnah, we find another instance, Ohalos 7:6, where, in order to save the mother, we cut the fetus up while in utero.

(ו) הָאִשָּׁה שֶׁהִיא מַקְשָׁה לֵילֵד, מְחַתְּכִין אֶת הַוָּלָד בְּמֵעֶיהָ וּמוֹצִיאִין אוֹתוֹ אֵבָרִים אֵבָרִים, מִפְּנֵי שֶׁחַיֶּיהָ קוֹדְמִין לְחַיָּיו. יָצָא רֻבּוֹ, אֵין נוֹגְעִין בּוֹ, שֶׁאֵין דּוֹחִין נֶפֶשׁ מִפְּנֵי נָפֶשׁ:

(6) If a woman is having trouble giving birth, they cut up the child in her womb and brings it forth limb by limb, because her life comes before the life of [the child]. But if the greater part has come out, one may not touch it, for one may not set aside one person's life for that of another.

Sources for Mishnah 4:3

The

(ה) תַּרְנְגוֹל שֶׁבָּלַע אֶת הַשֶּׁרֶץ וְנָפַל לַאֲוִיר הַתַּנּוּר, טָהוֹר. וְאִם מֵת, טָמֵא. הַשֶּׁרֶץ שֶׁנִּמְצָא בַתַּנּוּר, הַפַּת שֶׁבְּתוֹכוֹ, שְׁנִיָּה, שֶׁהַתַּנּוּר תְּחִלָּה:

(5) If a rooster that swallowed a sheretz fell within the air-space of an oven, the oven remains clean; If the rooster died, the oven becomes unclean. If a sheretz was found in an oven, any bread in it contracts second degree impurity since the oven is of the first degree.

(ה) יָצָא הָרִאשׁוֹן מֵת וְהַשֵּׁנִי חַי, טָהוֹר. הָרִאשׁוֹן חַי וְהַשֵּׁנִי מֵת, טָמֵא. רַבִּי מֵאִיר אוֹמֵר, בְּשָׁפִיר אֶחָד, טָמֵא. בִּשְׁנֵי שְׁפִירִים, טָהוֹר:

(5) If [at the birth of twins] the first came out dead and the second came out alive, the [live one] is clean. If the first was alive and the second dead, the [live child] is unclean. Rabbi Meir says: if they were in one sac, [the live child] is unclean, but if there were two sacs, it remains clean.

(ח) אָכַל אֳכָלִים טְמֵאִים, וְשָׁתָה מַשְׁקִים טְמֵאִים, טָבַל וֶהֱקִיאָן, טְמֵאִים, מִפְּנֵי שֶׁאֵינָן טְהוֹרִים בַּגּוּף. שָׁתָה מַיִם טְמֵאִים, טָבַל וֶהֱקִיאָם, טְהוֹרִים, מִפְּנֵי שֶׁהֵם טְהוֹרִים בַּגּוּף. בָּלַע טַבַּעַת טְהוֹרָה, נִכְנַס לְאֹהֶל הַמֵּת, הִזָּה וְשָׁנָה וְטָבַל וֶהֱקִיאָהּ, הֲרֵי הִיא כְמוֹת שֶׁהָיְתָה. בָּלַע טַבַּעַת טְמֵאָה, טוֹבֵל וְאוֹכֵל בַּתְּרוּמָה. הֱקִיאָהּ, טְמֵאָה וְטִמְּאַתּוּ. חֵץ שֶׁהוּא תָחוּב בָּאָדָם, בִּזְמַן שֶׁהוּא נִרְאֶה, חוֹצֵץ. וְאִם אֵינוֹ נִרְאֶה, טוֹבֵל וְאוֹכֵל בִּתְרוּמָתוֹ:

(8) If one ate unclean foods or drank unclean liquids and then he immersed and then vomited them up, they are still unclean because they did not become clean in the body. If one drank unclean water and immersed and then vomited it up, it is clean because it became clean in the body. If one swallowed a clean ring and then went into the tent of a corpse, if he sprinkled himself once and twice and immersed himself and then vomited it up, behold, it remains as it was before. If one swallowed an unclean ring, he may immerse himself and eat terumah. If he vomited it up, it is unclean and it renders him unclean. If an arrow was stuck into a man, it blocks so long as it is visible. But if it is not visible, he may immerse himself and eat terumah.

Sources for Mishnah 4:4

Our Mishnah has a dialogue testing the statements of the named Tanaim. We find this in other Mishnayos as well, e.g., Pesachim 6:5, Nedarim 10:6 and Zevachim 7:6.

(ה) הַפֶּסַח שֶׁשְּׁחָטוֹ שֶׁלֹּא לִשְׁמוֹ בְשַׁבָּת, חַיָּב עָלָיו חַטָּאת. וּשְׁאָר כָּל הַזְּבָחִים שֶׁשְּׁחָטָן לְשׁוּם פֶּסַח, אִם אֵינָן רְאוּיִין, חַיָּב. וְאִם רְאוּיִין הֵן, רַבִּי אֱלִיעֶזֶר מְחַיֵּב חַטָּאת, וְרַבִּי יְהוֹשֻׁעַ פּוֹטֵר. אָמַר רַבִּי אֱלִיעֶזֶר, מָה אִם הַפֶּסַח שֶׁהוּא מֻתָּר לִשְׁמוֹ, כְּשֶׁשִּׁנָּה אֶת שְׁמוֹ, חַיָּב, זְבָחִים שֶׁהֵן אֲסוּרִין לִשְׁמָן, כְּשֶׁשִּׁנָּה אֶת שְׁמָן, אֵינוֹ דִין שֶׁיְּהֵא חַיָּב. אָמַר לוֹ רַבִּי יְהוֹשֻׁעַ, לֹא, אִם אָמַרְתָּ בַּפֶּסַח, שֶׁשִּׁנָּהוּ לְדָבָר אָסוּר, תֹּאמַר בַּזְּבָחִים, שֶׁשִּׁנָּן לְדָבָר הַמֻּתָּר. אָמַר לוֹ רַבִּי אֱלִיעֶזֶר, אֵמוּרֵי צִבּוּר יוֹכִיחוּ, שֶׁהֵן מֻתָּרִין לִשְׁמָן, וְהַשּׁוֹחֵט לִשְׁמָן, חַיָּב. אָמַר לוֹ רַבִּי יְהוֹשֻׁעַ, לֹא, אִם אָמַרְתָּ בְאֵמוּרֵי צִבּוּר שֶׁיֵּשׁ לָהֶן קִצְבָּה, תֹּאמַר בַּפֶּסַח שֶׁאֵין לוֹ קִצְבָּה. רַבִּי מֵאִיר אוֹמֵר, אַף הַשּׁוֹחֵט לְשֵׁם אֵמוּרֵי צִבּוּר, פָּטוּר:

(5) If the pesah was slaughtered for a different purpose on Shabbat, he [the slaughterer] is liable to a sin-offering on its account. All other sacrifices which he slaughtered as a pesah: if they are not fit [to be a pesah] he is liable; if they are fit [to be a pesah]: Rabbi Eliezer makes him liable to a sin-offering, But Rabbi Joshua exempts him. Rabbi Eliezer said to him: if for the pesah, which it is permitted [to slaughter] for its own purpose, yet when he changes its purpose he is liable; then [other] sacrifices, which are forbidden [to slaughter even] for their own purpose, if he changes their purpose is it not logical that he should be liable. Rabbi Joshua said to him: not so. If you say [with regard to] the pesah, [he is liable] because he changed it to something that is forbidden; will you say [the same] of [other] sacrifices, where he changed them for something that is permitted? Rabbi Eliezer said to him: let the community sacrifices prove it, which are permitted for their own sake, yet he who slaughters [other sacrifices] in their name is liable. Rabbi Joshua said him: not so. If you say [with regard to] the public sacrifices, [that is] because they have a limit; will you say [the same] of the pesah, which has no limit? Rabbi Meir says: he too who slaughters [other sacrifices] in the name of public sacrifice is not liable.

(ו) שׁוֹמֶרֶת יָבָם, בֵּין לְיָבָם אֶחָד בֵּין לִשְׁנֵי יְבָמִין, רַבִּי אֱלִיעֶזֶר אוֹמֵר, יָפֵר. רַבִּי יְהוֹשֻׁעַ אוֹמֵר, לְאֶחָד אֲבָל לֹא לִשְׁנָיִם. רַבִּי עֲקִיבָא אוֹמֵר, לֹא לְאֶחָד וְלֹא לִשְׁנָיִם. אָמַר רַבִּי אֱלִיעֶזֶר, מָה אִם אִשָּׁה, שֶׁקָּנָה הוּא לְעַצְמוֹ, הֲרֵי הוּא מֵפֵר נְדָרֶיהָ, אִשָּׁה שֶׁהִקְנוּ לוֹ מִן הַשָּׁמַיִם, אֵינוֹ דִין שֶׁיָּפֵר נְדָרֶיהָ. אָמַר לוֹ רַבִּי עֲקִיבָא, לֹא, אִם אָמַרְתָּ בְאִשָּׁה שֶׁקָּנָה הוּא לְעַצְמוֹ, שֶׁאֵין לַאֲחֵרִים בָּהּ רְשׁוּת, תֹּאמַר בְּאִשָּׁה שֶׁהִקְנוּ לוֹ מִן הַשָּׁמַיִם, שֶׁיֵּשׁ לַאֲחֵרִים בָּהּ רְשׁוּת. אָמַר לוֹ רַבִּי יְהוֹשֻׁעַ, עֲקִיבָא, דְּבָרֶיךָ בִשְׁנֵי יְבָמִין. מָה אַתָּה מֵשִׁיב עַל יָבָם אֶחָד. אָמַר לוֹ, אֵין הַיְבָמָה גְמוּרָה לַיָּבָם כְּשֵׁם שֶׁהָאֲרוּסָה גְמוּרָה לְאִישָׁהּ:

(6) If a woman waits for a yavam, whether for one or for two [yevamim]: Rabbi Eliezer says: he can annul [her vows]. Rabbi Joshua says: [only if she waits] for one, but not for two. Rabbi Akiva says: neither for one nor for two. Rabbi Eliezer said: if a man can annul the vows of a woman whom he himself acquired, isn’t it logical that can he annul those of a woman bequeathed to him by Heaven! Rabbi Akiva said to him: No! If you speak of a woman whom he himself acquires, that is because others have no rights in her; will you say [the same] of a woman given to him by Heaven, in whom others too have rights! Rabbi Joshua said to him: Akiva, your words apply to two yevamim; but what will you answer if there is only one yavam? He (Rabbi Akiva) said to him (Rabbi Joshua): the yevamah is not as completely acquired to the yavam as a betrothed girl is to her [betrothed] husband.

(ו) מָלַק וְנִמְצָא טְרֵפָה, רַבִּי מֵאִיר אוֹמֵר, אֵינָהּ מְטַמְּאָה בְבֵית הַבְּלִיעָה. רַבִּי יְהוּדָה אוֹמֵר, מְטַמְּאָה בְבֵית הַבְּלִיעָה. אָמַר רַבִּי מֵאִיר, מָה אִם נִבְלַת בְּהֵמָה, שֶׁהִיא מְטַמְּאָה בְמַגָּע וּבְמַשָּׂא, שְׁחִיטָתָהּ מְטַהֶרֶת אֶת טְרֵפָתָהּ מִטֻּמְאָתָהּ, נִבְלַת הָעוֹף שֶׁאֵינָהּ מְטַמְּאָה בְמַגָּע וּבְמַשָּׂא, אֵינוֹ דִין שֶׁתְּהֵא שְׁחִיטָתָהּ מְטַהֶרֶת אֶת טְרֵפָתָהּ מִטֻּמְאָתָהּ. מַה מָּצִינוּ בִשְׁחִיטָתָהּ, שֶׁהִיא מַכְשַׁרְתָּהּ בַּאֲכִילָה, וּמְטַהֶרֶת אֶת טְרֵפָתָהּ מִטֻּמְאָתָהּ, אַף מְלִיקָתָהּ, שֶׁהִיא מַכְשַׁרְתָּהּ בַּאֲכִילָה, תְּטַהֵר אֶת טְרֵפָתָהּ מִטֻּמְאָתָהּ. רַבִּי יוֹסֵי אוֹמֵר, דַּיָּהּ כְּנִבְלַת בְּהֵמָה, שְׁחִיטָתָהּ מְטַהַרְתָּהּ, אֲבָל לֹא מְלִיקָתָהּ:

(6) If one performed melikah, and he found it [the bird] to be a terefah: Rabbi Meir said: it does not defile in the gullet; Rabbi Judah said: it does defile in the gullet. Rabbi Meir said: if with regard to a beast, when it is carrion (a nevelah) it defiles through contact or carrying, yet slaughtering it purifies its terefah from defiling, when it comes to carrion (nevelah) of a bird which does not defile through contact or carriage, is it not logical that slaughtering would cleanse its terefah? Now, just as we have found that slaughtering, which makes it [a bird of hullin] fit for eating, cleanses its terefah from its uncleanness; so melikah (nipping), which makes it [a bird sacrifice] fit for eating, cleanses its terefah. Rabbi Yose says: it is sufficient for it to be like the nevelah of a beast, which is cleansed by slaughtering, but not by melikah (nipping).

Sources for Mishnah 4:5

In describing the permutations of a Ben Pekuah, the final case is a calf that had full gestation and is found alive post-mortem. This suggests, thata fetus can survive its mother. The Mishnah in Nidah 5:3 (see TYT) implies, in connection with the laws of inheritance, that we assume that a fetus pre-deceases its mother in utero. See Tosfos ad. loc.

(ג) תִּינוֹקֶת בַּת יוֹם אֶחָד, מִטַּמְּאָה בְנִדָּה. בַּת עֲשָׂרָה יָמִים, מִטַּמְּאָה בְזִיבָה. תִּינוֹק בֶּן יוֹם אֶחָד, מִטַּמֵּא בְזִיבָה, וּמִטַּמֵּא בִנְגָעִים, וּמִטַּמֵּא בִטְמֵא מֵת, וְזוֹקֵק לְיִבּוּם, וּפוֹטֵר מִן הַיִּבּוּם, וּמַאֲכִיל בַּתְּרוּמָה, וּפוֹסֵל מִן הַתְּרוּמָה, וְנוֹחֵל וּמַנְחִיל. וְהַהוֹרְגוֹ, חַיָּב. וַהֲרֵי הוּא לְאָבִיו וּלְאִמּוֹ וּלְכָל קְרוֹבָיו כְּחָתָן שָׁלֵם:

(3) A girl one day old defiles due to menstruation. A girl ten days old defiles due to zivah. A boy one day old defiles due to zivah, and defiles due to scale disease and due to corpse uncleanness; He subjects [his deceased brother's widow] to yibbum [levirate marriage]; He exempts [his mother] from yibbum, He enables her to eat terumah And he disqualifies her from eating terumah; He inherits and transmits inheritance; He who kills him is guilty of murder, And he counts to his father, to his mother and to all his relatives as a fully grown man.

Sources for Mishnah 4:6

Our Mishnah teaches that a proper Shechitah is sufficient to permit a broken leg. Nevertheless, a when it comes to a Korban, broken leg is a blemish. Bechoros 6:8

(ח) נִשְׁבַּר עֶצֶם יָדוֹ, וְעֶצֶם רַגְלוֹ, אַף עַל פִּי שֶׁאֵינוֹ נִכָּר. מוּמִין אֵלּוּ מָנָה אִילָא בְיַבְנֶה, וְהוֹדוּ לוֹ חֲכָמִים. וְעוֹד שְׁלשָׁה הוֹסִיף. אָמְרוּ לוֹ, לֹא שָׁמַעְנוּ אֶת אֵלּוּ. אֵת שֶׁגַּלְגַּל עֵינוֹ עָגוֹל כְּשֶׁל אָדָם, וּפִיו דּוֹמֶה לְשֶׁל חֲזִיר, וְשֶׁנִּטַּל רֹב הַמְדַבֵּר שֶׁל לְשׁוֹנוֹ. וּבֵית דִּין שֶׁל אַחֲרֵיהֶן אָמְרוּ, הֲרֵי אֵלּוּ מוּמִין:

(8) If the bone of the fore-leg or of its hind-leg is broken, even though it is not noticeable, [this is a blemish]. These blemishes Ila enumerated in Yavneh and the sages agreed with him. He also added another three cases [of blemishes]. They said to him: we have only heard these [already mentioned previously]. [The three added by Ila were]: one whose eyeball is round like that of a human or whose mouth is like that of a pig or if the greater part of the speaking part of the tongue has been removed. A subsequent court ruled however: each of these cases is a [disqualifying] blemish.

Sources for Mishnah 4:7

Our Mishnah mentions not taking an action as it resembles "Darchei HaEmorie." We find reference to this in Shabbos (6:10) as well.

(י) יוֹצְאִין בְּבֵיצַת הַחַרְגּוֹל, וּבְשֵׁן שׁוּעָל, וּבְמַסְמֵר מִן הַצָּלוּב, מִשּׁוּם רְפוּאָה, דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים אוֹמְרִים, אַף בְּחֹל אָסוּר, מִשּׁוּם דַּרְכֵי הָאֱמוֹרִי:

(10) One may go out with a locust’s egg, a fox’s tooth, and a nail from [the cross of] a crucified convict for purposes of healing, the words of Rabbi Meir’s view. But the sages say: even on weekdays this is forbidden on account of “the ways of the Amorite” [which Israelites are forbidden from adopting].