Quoting%20commentary for Yevamot 160:3

כיון דאיכא רבן שמעון בן גמליאל דאמר משתהי כרבים עבד דתניא רשב"ג אומר כל ששהה ל' יום באדם אינו נפל

The reason then is because they were not developed, but had they been developed it would have been assumed that the child was a seven-month one<span class="x" onmousemove="('comment',' A child whose development is completed in the seventh month is viable. ');">⁷</span> only his [birth] was somewhat delayed.<span class="x" onmousemove="('comment',' R. Abbahu, supra, referring to such a case, teaches that, even according to Rabbi, no definite decision can be arrived at before the child has grown up and attained the age of twenty. ');">⁸</span> With reference, however, to the practical decision which Raba Tosfa'ah gave in the case of a woman whose husband had gone to a country beyond the sea and remained there for a full year of twelve months, where he declared the child legitimate,<span class="x" onmousemove="('comment',' Assuming, as he did, that it remained in utero three months after the nine-monthly period. ');">⁹</span>

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