For the source text click/tap here: Bava Batra 20
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The Gemara raises another objection to the assumption that an item for which there is a use does not reduce the dimensions of a window, even if is not susceptible to impurity, from a baraita:
...and a gentile sitting in the window; and a child born after eight months of pregnancy, who is not expected to survive,…
that is placed in the window; and salt; and an earthenware vessel; and a Torah scroll, all these reduce the dimensions of the window.
Consequently, impurity passes through only if there remains an open space of a square handbreadth.
We explore the notions of survival in pregnancy and the ancient belief that the eighth month of gestation alone is more dangerous than later.