Commentary for Yevamot 155:19

טעמא דכתיב אשר יולדו הא בעלמא בתר אבוה שדינן ליה אלא הא דאמר רבא נכרית מעוברת שנתגיירה בנה אין צריך טבילה אמאי אין צריך טבילה

What, however, of the following statement of Raba. 'If a pregnant gentile woman was converted, there is no need for her son to perform ritual immersion'.<span class="x" onmousemove="('comment',' Which forms a part of the conversion ceremonial. The immersion that had been performed by his mother exempts him also. ');">⁶³</span> Why<span class="x" onmousemove="('comment',' If the child is elsewhere not regarded as part of its mother. ');">⁶⁴</span> is there no need for him to perform immersion? Should you reply that it<span class="x" onmousemove="('comment',' The exemption of the child from the immersion. ');">⁶⁵</span> is due to a ruling of R. Isaac; for R. Isaac stated: Pentateuchally [a covering of] the greater part,<span class="x" onmousemove="('comment',' Of a hair (v. Rashi, Suk. 6b); that prevents it from coming in direct contact with the water. ');">⁶⁶</span>

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