הוֹצִיא יָדוֹ וְהֶחֱזִירָהּ פי’ קֹדֶם שְׁחִיטָה, מַה שֶּׁיָּצָא מִן הָאֵבֶר לַחוּץ, אָסוּר; אֲבָל מַה שֶּׁנִּשְׁאַר מִמֶּנּוּ בִּפְנִים, וּמְקוֹם חֲתָךְ, מֻתָּר; לֹא הֶחֱזִירָהּ קֹדֶם שְׁחִיטָה, גַּם מְקוֹם הַחֲתָךְ אָסוּר, אֲבָל מַה שֶּׁבִּפְנִים, מֻתָּר אֲפִלּוּ הוּא מִעוּטוֹ.
If the fetus sticks out a limb and then retracts it (before the slaughter is performed) the limb that came out is forbidden.
However what remained internal, from that place to cut, it is allowed; what returns it slaughtered, once the part that made its way outside of the cavity is cut off, the fetus is permitted.
But the area that made its way outside as well as the part that one cut is forbidden.
However the rest of it is allowed even in small amounts.