Reference for Niddah 53:25

טיפה אחת היתה ונתחלקה לשתים אחד נגמרה צורתו בתחלת ז' ואחד בסוף ט'

IF A PLACENTA IS WITHIN A HOUSE, THE HOUSE IS UNCLEAN. Our Rabbis taught: If a placenta is in a house, the house is unclean; not because a placenta is a child but because generally there can be no placenta with which there is no child; so R. Meir. R. Jose, R. Judah and R. Simeon regard [the house] as clean. 'Do you not agree', they said to R. Meir, 'that if it had been carried out in a bowl into an outer room it would be clean?' 'Indeed', he replied. 'But why?'<span class="x" onmousemove="('comment',' Should then the first house be unclean. ');">²¹</span>

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