Commentary for Sanhedrin 137:15

אמר רבי ירמיה מדפתי אף אנן נמי תנינא בת שלש שנים ויום אחד מתקדשת בביאה ואם בא עליה יבם קנאה וחייבין עליה משום אשת איש

Hence he must have caused conception before producing two hairs, and begot the child before the hair was fully grown; [and in that case he is excluded from the operation of the law] thus proving that a minor can beget children! — No. In truth, this refers to one who impregnated [his wife] after the appearance of two hairs, and begot [the child] after his hair was fully grown. But as for the difficulty raised by R. Keruspedai's dictum, — when R. Dimi came, he said: In the West [i.e.. Palestine], they explain [the deduction of the School of Ishmael] thus; a son, but not one who is fit to be called a father.<span class="x" onmousemove="('comment',' I.e., once his wife is impregnated he is already fit to be called a father. But it is unnecessary to exclude him when he is already a father, for by then this hair must be fully grown, and he is automatically excluded by the limitations expressed in the Mishnah. ');">¹⁴</span>

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