Reference for Bava Batra 284:1

דהוא מיית ברישא ואין הבן יורש את אמו בקבר להנחיל לאחין מן האב

— Because [the embryo] dies first<span class="x" onmousemove="('comment',' Before the mother. ');">¹</span> and no son in the grave<span class="x" onmousemove="('comment',' I.e. after his death. ');">²</span> may inherit from his mother to transmit [the inheritance] to his paternal brothers 'Do you mean to say that it<span class="x" onmousemove="('comment',' An embryo. ');">³</span>

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