Reference for Chullin 115:37

ומודים ודאי בביצת טריפה שאסורה בדשיחלא קמא מאי טעמא גופה היא

The law is: In a male twelve months is a criterion, and in a female, if it cannot bring forth young.<span class="x" onmousemove="('comment',' So that if a male or female animal has continued to live for twelve months after the day on which a doubt arose about it, or if a female animal has brought forth young, there is no longer any doubt about it and it is permitted.');">¹⁶</span>

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