Reference for Bava Batra 253:1

אמימר אמר אף אינו ממעט חלק בכורה שנא' (דברים כא, טו) וילדה לו בנים עד שיהא בן בשעת לידה

Amemar said: Nor does he reduce the portion of the birthright;<span class="x" onmousemove="('comment',' If the tumtum had, e.g., two brothers, one of whom was firstborn, the inherited estate is to be divided into three portions only, (as if the tumtum did not exist). Of these, the firstborn who is entitled to a double Portion (one ordinary and one as his birthright) receives one portion (that for the birthright), while the remaining two are subdivided into three Portions, each of the three brothers receiving one. The firstborn's portion of the birthright is thus in no way diminished through the existence of the tumtum. ');">¹</span> for it is said, <i>And they have born him sons</i><span class="x" onmousemove="('comment',' Deut., XXI. 15. ');">²</span> [which implies that] he must have been<span class="x" onmousemove="('comment',' V. note 7. ');">³</span> a son<span class="x" onmousemove="('comment',' Emphasis is laid on born and sons, in the text cited. ');">⁴</span>

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