Related for Bava Batra 283:7
תא שמע תינוק בן יום אחד נוחל ומנחיל בן יום אחד אין עובר לא הא אמר רב ששת נוחל בנכסי האם להנחיל לאחין מן האב ודוקא בן יום אחד אבל עובר לא מאי טעמא
— Surely R. Shesheth had explained<span class="x" onmousemove="('comment',' v.. Nid. loc. cit. ');"><sup>28</sup></span> [this as meaning]: He<span class="x" onmousemove="('comment',' An infant who Is one day old. ');"><sup>29</sup></span> inherits the estate of his mother to transmit [it]<span class="x" onmousemove="('comment',' When he dies. ');"><sup>30</sup></span> to his paternal brothers;<span class="x" onmousemove="('comment',' Born from the same father and not the same mother. ');"><sup>31</sup></span> hence, only [then when he is] one day old but not [when] an embryo.What is the reason?
Tosefta Ketubot
A convert that died and Jews divided up his property [if he has no children, since he has no legal connections to his Gentile family], but afterwards it was known that he had children or that his wife was pregnant—all of them [the Jews] are required to return [the property they took]. They returned everything, but his sons died or his wife miscarried, anyone who held possession [over his stuff] the second time keeps it, but from the first time does not.
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