Reference for Chullin 102:3

הכא במאי עסקינן

but not by reason of an accident!<span class="x" onmousemove="('comment',' V. Zabin II. 2. Any issue in a person caused by an accident or injury does not produce the uncleanness which normally results from an issue. Now if there is any apprehension that a child, whilst passing through the womb, might suffer an injury, he should not then convey uncleanness by reason of his issue, for it might have been caused by an accidental injury in birth.');">²</span>

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